기탄수학 K1 답지 정답

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(1)

① 2 ② 1 ③ 0 ④ 1 ⑤ 2 ⑥ 3 ⑦ 4 ⑧ 2 ⑨ 1 ⑩ 0 ⑪ 1 ⑫ 2 ⑬ 3 ⑭ 4 ⑮ 5 � 4 � 3 � 2 � 1 � 0 � -1 � -2 � -3 � -4 � 4 � 3 � 2 � 1 � 0 � -1 -2 32-3 33-4 34-5 31 <풀이> ※ 식의 처음 수가 양수이거나 답이 양수일 때 에는 양의 부호 +를 생략할 수 있다.

+a는‘플러스 a’, -a는‘마이너스 a’라고 읽는

다. 또, 0은 양수도 아니고 음수도 아니다. 즉, 모 든 수는 양수, 음수, 0으로 분류할 수 있다. ① 4-2=2 ② 4-3=1 ③ 4-4=0 ④ 4-5=-1 ⑤ 4-6=-2 ⑥ 4-7=-3 ⑦ 4-8=-4 ⑧ 5-3=2 ⑨ 5-4=1 ⑩ 5-5=0 ⑪ 5-6=-1 ⑫ 5-7=-2 ⑬ 5-8=-3 ⑭ 5-9=-4 ⑮ 6-1=5 � 6-2=4 � 6-3=3 � 6-4=2 � 6-5=1 � 6-6=0 � 6-7=-1 � 6-8=-2 � 6-9=-3 � 6-10=-4 � 7-3=4 � 7-4=3 � 7-5=2 � 7-6=1 � 7-7=0 � 7-8=-1 7-9=-2 7-10=-3 7-11=-4 7-12=-5 34 33 32 31 ① 3 ② 2 ③ 1 ④ 0 ⑤ -1 ⑥ -2 ⑦ -3 ⑧ -4 ⑨ -5 ⑩ -6 ⑪ 2 ⑫ 1 ⑬ 0 ⑭ -1 ⑮ -2 � -3 � -4 � -5 � -6 � -7 � 1 � 0 � -1 � -2 � -3 � 1 � 0 � -1 � -2 � -4 1 0 -1 -2 -5 1 370 38-1 39 -2 40-6 36 35 34 33 32 31 <풀이> ① 8-5=3 ② 8-6=2 ③ 8-7=1 ④ 8-8=0 ⑤ 8-9=-1 ⑥ 8-10=-2 ⑦ 8-11=-3 ⑧ 8-12=-4 ⑨ 8-13=-5 ⑩ 8-14=-6 ⑪ 9-7=2 ⑫ 9-8=1 ⑬ 9-9=0 ⑭ 9-10=-1 ⑮ 9-11=-2 � 9-12=-3 � 9-13=-4 � 9-14=-5 � 9-15=-6 � 9-16=-7 � 10-9=1 � 10-10=0 � 10-11=-1 � 10-12=-2 � 10-13=-3 � 11-10=1 � 11-11=0 � 11-12=-1 � 11-13=-2 � 11-15=-4 12-11=1 12-12=0 12-13=-1 12-14=-2 12-17=-5 13-12=1 13-13=0 13-14=-1 38 37 36 35 34 33 32 31

(2)

13-15=-2 13-19=-6 40 39 � 10-5=5 � 5-10=-(10-5)=-5 1-0=1 0-1=-(1-0)=-1 4-2=2 2-4=-(4-2)=-2 9-6=3 6-9=-(9-6)=-3 7-3=4 3-7=-(7-3)=-4 6-1=5 1-6=-(6-1)=-5 40 39 38 37 36 35 34 33 32 31 ① 1 ② 1 ③ 2 ④ -2 ⑤ 2 ⑥ -2 ⑦ 3 ⑧ -3 ⑨ 3 ⑩ -3 ⑪ 3 ⑫ -3 ⑬ 1 ⑭ -1 ⑮ 4 � -4 � 2 � -2 � 5 � -5 � 1 � -1 � 2 � -2 � 3 � -3 � 4 � -4 � 5 � -5 1 -1 2 -2 3 -3 374 38-4 39 5 40-5 36 35 34 33 32 31 <풀이> ※ 여기 3a부터 15b까지는 암산으로 계산을 하 여 답을 써야 한다. 다음의 풀이는 암산이 안 되 는 학생들을 위하여 써 놓은 것이므로, 계산 과 정을 참조하여 답만 쓰도록 한다. ① 4-3=1 ② 3-4=-(4-3)=-1 ③ 5-3=2 ④ 3-5=-(5-3)=-2 ⑤ 6-4=2 ⑥ 4-6=-(6-4)=-2 ⑦ 7-4=3 ⑧ 4-7=-(7-4)=-3 ⑨ 8-5=3 ⑩ 5-8=-(8-5)=-3 ⑪ 4-1=3 ⑫ 1-4=-(4-1)=-3 ⑬ 5-4=1 ⑭ 4-5=-(5-4)=-1 ⑮ 6-2=4 � 2-6=-(6-2)=-4 � 7-5=2 � 5-7=-(7-5)=-2 � 8-3=5 � 3-8=-(8-3)=-5 � 2-1=1 � 1-2=-(2-1)=-1 � 3-1=2 � 1-3=-(3-1)=-2 � 5-2=3 � 2-5=-(5-2)=-3 � 8-4=4 � 4-8=-(8-4)=-4 ① 1 ② 1 ③ ④ - ⑤ ⑥ - ⑦ ⑧ - ⑨ ⑩ -⑪ ⑫ - ⑬ ⑭ - ⑮ � - � � - � � -� � - � � - � � - � � - � � --6 19 32 6 19 31 4 17 4 17 3 4 3 4 7 13 7 13 1 5 1 5 5 11 5 11 2 9 2 9 2 7 2 7 2 11 2 11 5 9 5 9 1 7 1 7 3 5 3 5 3 11 3 11 4 9 4 9 2 7 2 7 <풀이> ① - = ② - =-& - *=-③ - = ④ - =-& - *=-⑤ - = ⑥ - =-& - *=-⑦ - = ⑧ - =-& - *=-3 11 5 11 8 11 8 11 5 11 3 11 5 11 8 11 4 9 1 9 5 9 5 9 1 9 4 9 1 9 5 9 2 7 4 7 6 7 6 7 4 7 2 7 4 7 6 7 1 5 2 5 3 5 3 5 2 5 1 5 2 5 3 5

(3)

⑨ - = ⑩ - =-& - *=-⑪ - = ⑫ - =-& - *=-⑬ - = ⑭ - =-& - *=-⑮ - = � - =-& - *=-� - = � - =-& - *=-� - = � - =-& - *=-� - = � - =-& - *=-� - = � - =-& - *=-� - = � - =-& - *=-� -0= � 0- =-& -0*=-� - = � - =-& - *=-- = - =-& - *=-6 19 3 19 9 19 9 19 3 19 32 6 19 3 19 9 19 31 4 17 6 17 10 17 10 17 6 17 4 17 6 17 10 17 3 4 3 4 3 4 3 4 3 4 7 13 5 13 12 13 12 13 5 13 7 13 5 13 12 13 1 5 1 5 2 5 2 5 1 5 1 5 1 5 2 5 5 11 4 11 9 11 9 11 4 11 5 11 4 11 9 11 2 9 2 9 4 9 4 9 2 9 2 9 2 9 4 9 2 7 3 7 5 7 5 7 3 7 2 7 3 7 5 7 2 11 3 11 5 11 5 11 3 11 2 11 3 11 5 11 5 9 2 9 7 9 7 9 2 9 5 9 2 9 7 9 1 7 2 7 3 7 3 7 2 7 1 7 2 7 3 7 3 5 1 5 4 5 4 5 1 5 3 5 1 5 4 5 ① -3 ② -6 ③ 5 ④ -1 ⑤ -2 ⑥ 1 ⑦ 8 ⑧ -1 ⑨ 6 ⑩ -1 ⑪ -5 ⑫ 1 ⑬ -6 ⑭ -4 ⑮ 7 � -3 � -4 � 3 � -6 � 4 � -20 � -30 � 13 � 14 � -50 � -24 � 10 � 40 � -25 � -5 130 -24 -240 200 -300 222 37-50 38-90 39 148 40-22 36 35 34 33 32 31 <풀이> ① 3-6=-(6-3)=-3 ② 2-8=-(8-2)=-6 ③ 5-0=5 ④ 8-9=-(9-8)=-1 ⑤ 6-8=-(8-6)=-2 ⑥ 8-7=1 ⑦ 10-2=8 ⑧ 5-6=-(6-5)=-1 ⑨ 7-1=6 ⑩ 6-7=-(7-6)=-1 ⑪ 2-7=-(7-2)=-5 ⑫ 10-9=1 ⑬ 4-10=-(10-4)=-6 ⑭ 1-5=-(5-1)=-4 ⑮ 9-2=7 � 7-10=-(10-7)=-3 � 0-4=-(4-0)=-4 � 6-3=3 � 3-9=-(9-3)=-6 � 9-5=4 � 5-25=-(25-5)=-20 � 10-40=-(40-10)=-30 � 19-6=13 � 32-18=14 � 20-70=-(70-20)=-50 � 39-63=-(63-39)=-24 � 40-30=10 � 56-16=40 � 30-55=-(55-30)=-25 � 8-13=-(13-8)=-5 150-20=130 14-38=-(38-14)=-24 15-255=-(255-15)=-240 500-300=200 100-400=-(400-100)=-300 345-123=222 50-100=-(100-50)=-50 260-350=-(350-260)=-90 38 37 36 35 34 33 32 31

(4)

404-256=148 48-70=-(70-48)=-22 40 39 ⑮ - =-& - *=-� - =-& - *=-� - = = � - =-& - *=- =-� - =-& - *=- =-� - = = � - =-& - *=- =-� - = = � - & - * =-� - =-& - *=- =-� - =-& - *=- =-� - = = � - & - * =-� - =-& - *=- =-� - = = � - =-& - *=- =-- = = - =-& - *=- =-2 15 4 30 7 30 11 30 11 30 7 30 32 1 5 2 10 1 10 3 10 31 2 7 8 28 9 28 17 28 17 28 9 28 4 11 8 22 5 22 13 22 2 5 6 15 2 15 8 15 8 15 2 15 2 3 6 9 2 9 8 9 8 9 2 9 3 8 6 16 3 16 9 16 1 7 3 21 2 21 5 21 5 21 2 21 5 12 10 24 7 24 17 24 17 24 7 24 2 3 4 6 1 6 5 6 5 6 1 6 3 5 12 20 7 20 19 20 2 13 4 26 5 26 9 26 9 26 5 26 1 2 6 12 5 12 11 12 1 5 5 25 3 25 8 25 8 25 3 25 2 7 4 14 5 14 9 14 9 14 5 14 1 2 4 8 3 8 7 8 7 29 5 29 12 29 12 29 5 29 5 7 1 7 6 7 6 7 1 7 ① - ② ③ - ④ - ⑤ ⑥ - ⑦ ⑧ - ⑨ ⑩ -⑪ - ⑫ ⑬ - ⑭ ⑮ -� - � � - � - � � - � � - � - � -� � - � - � � --2 15 32 1 5 31 2 7 4 11 2 5 2 3 3 8 1 7 5 12 2 3 3 5 2 13 1 2 1 5 2 7 1 2 7 29 5 7 5 31 3 17 2 9 1 25 9 11 11 23 4 9 2 11 4 27 10 19 1 5 5 13 3 7 2 21 <풀이> ① - =-& - *=-② - = ③ - =-& - *=-④ - =-& - *=-⑤ - = ⑥ - =-& - *=-⑦ - = ⑧ - =-& - *=-⑨ - = ⑩ - =-& - *=-⑪ - =-& - *=-⑫ - = ⑬ - =-& - *=-⑭ - =5 31 6 31 11 31 3 17 6 17 9 17 9 17 6 17 2 9 5 9 7 9 1 25 1 25 2 25 2 25 1 25 9 11 1 11 10 11 10 11 1 11 11 23 3 23 14 23 4 9 4 9 8 9 8 9 4 9 2 11 4 11 6 11 4 27 7 27 11 27 11 27 7 27 10 19 5 19 15 19 1 5 3 5 4 5 4 5 3 5 5 13 2 13 7 13 7 13 2 13 3 7 2 7 5 7 2 21 8 21 10 21 10 21 8 21 ① 1 ② 1 ③ 2 ④ -2 ⑤ 2 ⑥ -2 ⑦ 3 ⑧ -3 ⑨ 3 ⑩ -3 ⑪ 3 ⑫ -3 ⑬ 1 ⑭ -1 ⑮ 4 � -4 � 2 � -2 � 5 � -5 � 1 � -1 � 2 � -2 � 2 � -2 � 1 � -1 � 5 � -5 5 -5 2 -2 3 -3 376 38-6 39 3 40-3 36 35 34 33 32 31

(5)

<풀이> ① -4+5=+(5-4)=1 ② -5+4=-(5-4)=-1 ③ -4+6=+(6-4)=2 ④ -6+4=-(6-4)=-2 ⑤ -5+7=+(7-5)=2 ⑥ -7+5=-(7-5)=-2 ⑦ -5+8=+(8-5)=3 ⑧ -8+5=-(8-5)=-3 ⑨ -6+9=+(9-6)=3 ⑩ -9+6=-(9-6)=-3 ⑪ -2+5=+(5-2)=3 ⑫ -5+2=-(5-2)=-3 ⑬ -5+6=+(6-5)=1 ⑭ -6+5=-(6-5)=-1 ⑮ -3+7=+(7-3)=4 � -7+3=-(7-3)=-4 � -6+8=+(8-6)=2 � -8+6=-(8-6)=-2 � -4+9=+(9-4)=5 � -9+4=-(9-4)=-5 � -2+3=+(3-2)=1 � -3+2=-(3-2)=-1 � -7+9=+(9-7)=2 � -9+7=-(9-7)=-2 � -3+5=+(5-3)=2 � -5+3=-(5-3)=-2 � -1+2=+(2-1)=1 � -2+1=-(2-1)=-1 � -3+8=+(8-3)=5 � -8+3=-(8-3)=-5 -1+6=+(6-1)=5 -6+1=-(6-1)=-5 -2+4=+(4-2)=2 -4+2=-(4-2)=-2 -7+10=+(10-7)=3 -10+7=-(10-7)=-3 -3+9=+(9-3)=6 -9+3=-(9-3)=-6 -4+7=+(7-4)=3 -7+4=-(7-4)=-3 40 39 38 37 36 35 34 33 32 31 ⑪ ⑫ - ⑬ ⑭ - ⑮ � - � � - � � -� � - � � - � � - � � - � � --2 15 32 2 15 31 3 19 3 19 1 7 1 7 6 13 6 13 1 17 1 17 2 9 2 9 4 11 4 11 2 5 2 5 5 13 5 13 3 11 3 11 4 9 4 9 <풀이> ① 3 ② 3 ③ ④ - ⑤ ⑥ - ⑦ ⑧ - ⑨ ⑩ -2 7 2 7 4 13 4 13 5 11 5 11 1 9 1 9 ① - + =+& - *= ② - + =-& - *=-③ - + =+& - *= ④ - + =-& - *=-⑤ - + =+& - *= ⑥ - + =-& - *=-⑦ - + =+& - *= ⑧ - + =-& - *=-⑨ - + =+& - *= ⑩ - + =-& - *=-⑪ - + =+& - *= ⑫ - + =-& - *=-⑬ - + =+& - *= ⑭ - + =-& - *=-⑮ - + =+& - *= � - + =-& - *=-� - + =+& - *= � - + =-& - *=-� - + =+& - *=4 11 3 11 7 11 7 11 3 11 2 5 1 5 3 5 1 5 3 5 2 5 1 5 3 5 3 5 1 5 5 13 3 13 8 13 3 13 8 13 5 13 3 13 8 13 8 13 3 13 3 11 2 11 5 11 2 11 5 11 3 11 2 11 5 11 5 11 2 11 4 9 4 9 8 9 4 9 8 9 4 9 4 9 8 9 8 9 4 9 2 7 1 7 3 7 1 7 3 7 2 7 1 7 3 7 3 7 1 7 4 13 5 13 9 13 5 13 9 13 4 13 5 13 9 13 9 13 5 13 5 11 3 11 8 11 3 11 8 11 5 11 3 11 8 11 8 11 3 11 1 9 1 9 2 9 1 9 2 9 1 9 1 9 2 9 2 9 1 9 3 7 3 7 6 7 3 7 6 7 3 7 3 7 6 7 6 7 3 7

(6)

⑩ -9+8=-(9-8)=-1 ⑪ -8+10=+(10-8)=2 ⑫ -3+1=-(3-1)=-2 ⑬ -2+9=+(9-2)=7 ⑭ -8+2=-(8-2)=-6 ⑮ -6+10=+(10-6)=4 � -1+4=+(4-1)=3 � -6+3=-(6-3)=-3 � -4+8=+(8-4)=4 � -7+6=-(7-6)=-1 � -1+5=+(5-1)=4 � -5+35=+(35-5)=30 � -50+20=-(50-20)=-30 � -18+7=-(18-7)=-11 � -43+15=-(43-15)=-28 � -30+60=+(60-30)=30 � -29+71=+(71-29)=42 � -90+60=-(90-60)=-30 � -27+57=+(57-27)=30 � -10+45=+(45-10)=35 � -12+9=-(12-9)=-3 -160+50=-(160-50)=-110 -52+83=+(83-52)=31 -246+16=-(246-16)=-230 -200+700=+(700-200)=500 -500+400=-(500-400)=-100 -165+169=+(169-165)=4 -240+150=-(240-150)=-90 -100+70=-(100-70)=-30 -127+306=+(306-127)=179 -11+40=+(40-11)=29 40 39 38 37 36 35 34 33 32 31 � - + =-& - *=-� - + =+& - *= � - + =-& - *=-� - + =+& - *= � - + =-& - *=-� - + =+& - *= � - + =-& - *=-� - + =+& - *= � - + =-& - *=-� - + =+& - *= � - + =-& - *=-- + =+& - *= - + =-& - *=-2 15 11 15 13 15 11 15 13 15 32 2 15 11 15 13 15 13 15 11 15 31 3 19 2 19 5 19 2 19 5 19 3 19 2 19 5 19 5 19 2 19 1 7 3 7 4 7 3 7 4 7 1 7 3 7 4 7 4 7 3 7 6 13 4 13 10 13 4 13 10 13 6 13 4 13 10 13 10 13 4 13 1 17 8 17 9 17 8 17 9 17 1 17 8 17 9 17 9 17 8 17 2 9 5 9 7 9 5 9 7 9 2 9 5 9 7 9 7 9 5 9 4 11 3 11 7 11 3 11 7 11 ① -8 ② 4 ③ -9 ④ 1 ⑤ -4 ⑥ 1 ⑦ 5 ⑧ -7 ⑨ 0 ⑩ -1 ⑪ 2 ⑫ -2 ⑬ 7 ⑭ -6 ⑮ 4 � 3 � -3 � 4 � -1 � 4 � 30 � -30 � -11 � -28 � 30 � 42 � -30 � 30 � 35 � -3 -110 31 -230 500 -100 4 37-90 38-30 39 179 4029 36 35 34 33 32 31 <풀이> ① -9+1=-(9-1)=-8 ② -2+6=+(6-2)=4 ③ -10+1=-(10-1)=-9 ④ -7+8=+(8-7)=1 ⑤ -5+1=-(5-1)=-4 ⑥ -8+9=+(9-8)=1 ⑦ -2+7=+(7-2)=5 ⑧ -10+3=-(10-3)=-7 ⑨ -7+7=0 ① - ② ③ - ④ ⑤ -⑥ ⑦ ⑧ - ⑨ ⑩ 0 ⑪ - ⑫ ⑬ ⑭ - ⑮ -� � � - � � -� � - � � - � -� � � - � � - -2 5 32 3 7 31 2 7 2 3 1 4 3 5 2 9 2 5 2 11 1 3 5 13 1 3 4 15 2 3 3 8 1 2 2 7 3 29 5 17 4 23 6 11 8 27 6 19 3 11 7 9 13 31 4 21 1 5 9 25 2 13 4 7

(7)

<풀이> ① - + =-& - *=-② - + =+& - *= ③ - + =-& - *=-④ - + =+& - *= ⑤ - + =-& - *=-⑥ - + =+& - *= ⑦ - + =+& - *= ⑧ - + =-& - *=-⑨ - + =+& - *= ⑩ - + =0 ⑪ - + =-& - *=-⑫ - + =+& - *= ⑬ - + =+& - *= ⑭ - + =-& - *=-⑮ - + =-& - *=-� - + =+& - *= � - + =+& - *= = � - + =-& - *=- =-� - + =+& - *= = � - + =-& - *=- =-� - + =+& - *= = � - + =-& - *=- =-� - + =+& - *= = � - + =-& - *=- =-2 11 4 22 5 22 9 22 5 22 9 22 1 3 3 9 4 9 7 9 7 9 4 9 5 13 10 26 9 26 19 26 9 26 19 26 1 3 4 12 7 12 11 12 11 12 7 12 4 15 8 30 11 30 19 30 11 30 19 30 2 3 14 21 2 21 16 21 16 21 2 21 3 8 6 16 7 16 13 16 7 16 13 16 1 2 2 4 1 4 3 4 3 4 1 4 2 7 2 7 4 7 4 7 2 7 3 29 6 29 9 29 6 29 9 29 5 17 3 17 8 17 3 17 8 17 4 23 8 23 12 23 12 23 8 23 6 11 4 11 10 11 10 11 4 11 8 27 2 27 10 27 2 27 10 27 2 9 2 9 6 19 3 19 9 19 9 19 3 19 3 11 3 11 6 11 3 11 6 11 7 9 1 9 8 9 8 9 1 9 13 31 7 31 20 31 20 31 7 31 4 21 13 21 17 21 13 21 17 21 1 5 1 5 2 5 2 5 1 5 9 25 8 25 17 25 8 25 17 25 2 13 4 13 6 13 6 13 4 13 4 7 2 7 6 7 2 7 6 7 � - + =-& - *=- =-� - + =+& - *= = � - + =+& - *= = � - + & - * =-� - + =+& - *= = � - + =+& - *= = - + =-& - *=- =-- + =-& - *=- =-2 5 8 20 9 20 17 20 9 20 17 20 32 3 7 6 14 3 14 9 14 3 14 9 14 31 2 7 8 28 5 28 13 28 13 28 5 28 2 3 10 15 1 15 11 15 11 15 1 15 1 4 2 8 3 8 5 8 3 8 5 8 3 5 15 25 2 25 17 25 17 25 2 25 2 9 4 18 1 18 5 18 5 18 1 18 2 5 4 10 3 10 7 10 3 10 7 10 ① 5 ② 5 ③ -7 ④ -7 ⑤ -8 ⑥ -8 ⑦ -10 ⑧ -10 ⑨ -11 ⑩ -11 ⑪ -6 ⑫ -6 ⑬ -8 ⑭ -8 ⑮ -10 � -10 � -12 � -12 � -9 � -9 � -5 � -5 � -10 � -10 � -9 � -9 � -6 � -6 � -14 � -14 -9 -9 -12 -12 -3 -3 37-14 38-14 39 -7 40-7 36 35 34 33 32 31 <풀이> ① -4-1=-(4+1)=-5 ② -1-4=-(1+4)=-5 ③ -5-2=-(5+2)=-7 ④ -2-5=-(2+5)=-7 ⑤ -6-2=-(6+2)=-8 ⑥ -2-6=-(2+6)=-8 ⑦ -7-3=-(7+3)=-10 ⑧ -3-7=-(3+7)=-10 ⑨ -8-3=-(8+3)=-11 ⑩ -3-8=-(3+8)=-11 ⑪ -4-2=-(4+2)=-6 ⑫ -2-4=-(2+4)=-6 ⑬ -5-3=-(5+3)=-8 ⑭ -3-5=-(3+5)=-8 ⑮ -6-4=-(6+4)=-10 � -4-6=-(4+6)=-10 � -7-5=-(7+5)=-12 � -5-7=-(5+7)=-12

(8)

� -8-1=-(8+1)=-9 � -1-8=-(1+8)=-9 � -3-2=-(3+2)=-5 � -2-3=-(2+3)=-5 � -9-1=-(9+1)=-10 � -1-9=-(1+9)=-10 � -7-2=-(7+2)=-9 � -2-7=-(2+7)=-9 � -5-1=-(5+1)=-6 � -1-5=-(1+5)=-6 � -10-4=-(10+4)=-14 � -4-10=-(4+10)=-14 -6-3=-(6+3)=-9 -3-6=-(3+6)=-9 -8-4=-(8+4)=-12 -4-8=-(4+8)=-12 -2-1=-(2+1)=-3 -1-2=-(1+2)=-3 -9-5=-(9+5)=-14 -5-9=-(5+9)=-14 -4-3=-(4+3)=-7 -3-4=-(3+4)=-7 40 39 38 37 36 35 34 33 32 31 ① 4 ② 4 ③ - ④ - ⑤ -⑥ - ⑦ - ⑧ - ⑨ - ⑩ -⑪ - ⑫ - ⑬ - ⑭ - ⑮ -� - � - � - � - � -� - � - � - � - � -� - � - � - � - � -- -15 19 32 15 19 31 3 7 3 7 7 13 7 13 11 15 11 15 7 9 7 9 10 17 10 17 4 5 4 5 9 11 9 11 12 17 12 17 12 13 12 13 10 11 10 11 6 7 6 7 11 17 11 17 9 13 9 13 7 11 7 11 <풀이> ① - - =-& + ② - - =-& + *=-③ - - =-& + *=-7 11 3 11 4 11 3 11 4 11 4 7 3 7 1 7 3 7 1 7 4 7 1 7 3 7 1 7 3 7 ④ - - =-& + *=-⑤ - - =-& + *=-⑥ - - =-& + *=-⑦ - - =-& + *=-⑧ - - =-& + ⑨ - - =-& + ⑩ - - =-& + *=-⑪ - - =-& + *=-⑫ - - =-& + *=-⑬ - - =-& + *=-⑭ - - =-& + *=-⑮ - - =-& + *=-� - - =-& + *=-� - - =-& + *=-� - - =-& + � - - =-& + � - - =-& + *=-� - - =-& + *=-� - - =-& + � - - =-& + � - - =-& + *=-� - - =-& + *=-� - - =-& + *=-� - - =-& + *=-� - - =-& + *=-7 13 4 13 3 13 4 13 3 13 7 13 3 13 4 13 3 13 4 13 11 15 7 15 4 15 7 15 4 15 11 15 4 15 7 15 4 15 7 15 7 9 5 9 2 9 5 9 2 9 7 9 2 9 5 9 2 9 5 9 10 17 6 17 4 17 6 17 4 17 10 17 4 17 6 17 4 17 6 17 4 5 3 5 1 5 3 5 1 5 4 5 1 5 3 5 1 5 3 5 9 11 7 11 2 11 7 11 2 11 9 11 2 11 7 11 2 11 7 11 12 17 10 17 2 17 10 17 2 17 12 17 2 17 10 17 2 17 10 17 12 13 9 13 3 13 9 13 3 13 12 13 3 13 9 13 3 13 9 13 10 11 6 11 4 11 6 11 4 11 10 11 4 11 6 11 4 11 6 11 6 7 4 7 2 7 4 7 2 7 6 7 2 7 4 7 2 7 4 7 11 17 6 17 5 17 6 17 5 17 11 17 5 17 6 17 5 17 6 17 9 13 5 13 4 13 5 13 4 13 9 13 4 13 5 13 4 13 5 13 7 11 4 11 3 11 4 11 3 11

(9)

① - ② - ③ - ④ - ⑤ -⑥ - ⑦ - ⑧ - ⑨ - ⑩ -⑪ - ⑫ - ⑬ - ⑭ - ⑮ -� - � - � - � - � -� - � - � - � - � -� - � - � - � - � -- -1 2 32 2 3 31 11 12 1 2 5 7 1 3 4 7 4 5 3 4 3 5 3 4 2 3 6 11 4 7 8 13 2 5 13 21 9 11 6 7 7 25 23 31 13 15 8 29 8 9 8 13 19 27 8 19 5 9 5 7 17 23 2 3 12 17 ① - - =-& + ② - - =-& + *=-③ - - =-& + ④ - - =-& + ⑤ - - =-& + *=-⑥ - - =-& + *=-⑦ - - =-& + *=-19 27 11 27 8 27 11 27 8 27 8 19 3 19 5 19 3 19 5 19 5 9 1 9 4 9 1 9 4 9 5 7 2 7 3 7 2 7 3 7 17 23 10 23 7 23 10 23 7 23 2 3 1 3 1 3 1 3 1 3 12 17 8 17 4 17 8 17 4 17 <풀이> <풀이> ① -2-8=-(2+8)=-10 ② -1-1=-(1+1)=-2 ③ -10-6=-(10+6)=-16 ④ -9-4=-(9+4)=-13 ⑤ -5-5=-(5+5)=-10 ⑥ -7-4=-(7+4)=-11 ⑦ -10-8=-(10+8)=-18 ⑧ -1-10=-(1+10)=-11 ⑨ -9-6=-(9+6)=-15 ⑩ -6-1=-(6+1)=-7 ⑪ -1-7=-(1+7)=-8 ⑫ -6-8=-(6+8)=-14 ⑬ -7-9=-(7+9)=-16 ⑭ -5-6=-(5+6)=-11 ⑮ -2-9=-(2+9)=-11 � -4-5=-(4+5)=-9 � -3-10=-(3+10)=-13 � -9-9=-(9+9)=-18 � -7-6=-(7+6)=-13 � -8-5=-(8+5)=-13 � -3-21=-(3+21)=-24 � -10-20=-(10+20)=-30 � -16-9=-(16+9)=-25 � -35-15=-(35+15)=-50 � -40-30=-(40+30)=-70 � -19-21=-(19+21)=-40 � -20-40=-(20+40)=-60 � -17-50=-(17+50)=-67 � -30-20=-(30+20)=-50 � -7-17=-(7+17)=-24 -110-20=-(110+20)=-130 -24-31=-(24+31)=-55 -355-44=-(355+44)=-399 -300-400=-(300+400)=-700 -43-15=-(43+15)=-58 -38-142=-(38+142)=-180 -100-100=-(100+100)=-200 -59-41=-(59+41)=-100 -239-172=-(239+172)=-411 -18-36=-(18+36)=-54 40 39 38 37 36 35 34 33 32 31 � - - =-& + � - - =-& + *=-- - =-& + *=-- - =-& + *=-15 19 10 19 5 19 10 19 5 19 32 15 19 5 19 10 19 5 19 10 19 31 3 7 2 7 1 7 2 7 1 7 3 7 1 7 2 7 1 7 2 7 ① -10 ② -2 ③ -16 ④ -13 ⑤ -10 ⑥ -11 ⑦ -18 ⑧ -11 ⑨ -15 ⑩ -7 ⑪ -8 ⑫ -14 ⑬ -16 ⑭ -11 ⑮ -11 � -9 � -13 � -18 � -13 � -13 � -24 � -30 � -25 � -50 � -70 � -40 � -60 � -67 � -50 � -24 -130 -55 -399 -700 -58 -180 37-200 38-100 39 -411 40-54 36 35 34 33 32 31

(10)

⑧ - - =-& + ⑨ - - =-& + *=-⑩ - - =-& + *=-⑪ - - =-& + *=-⑫ - - =-& + *=-⑬ - - =-& + ⑭ - - =-& + *=-⑮ - - =-& + *=-� - - =-& + *=-� - - =-& + *=- =-� - - =-& + *=- =-� - - =-& + *=- =-� - - =-& + *=- =-� - - =-& + *=- � - - & + * =-� - - =-& + *=- =-� - - =-& + *=- =-� - - =-& + *=- =-� - - =-& + *=- � - - & + * =-� - - =-& + *=- =-� - - =-& + *=- =-� - - =-& + *=- - - =-& + *=- =- =-- - =-& + *=- =-1 2 10 20 3 20 7 20 3 20 7 20 32 2 3 6 9 4 9 2 9 4 9 2 9 31 11 12 22 24 5 24 17 24 5 24 17 24 1 2 6 12 1 12 5 12 1 12 5 12 5 7 15 21 11 21 4 21 11 21 4 21 1 3 2 6 1 6 1 6 1 6 1 6 4 7 16 28 3 28 13 28 3 28 13 28 4 5 12 15 8 15 4 15 8 15 4 15 3 4 12 16 3 16 9 16 3 16 9 16 3 5 15 25 9 25 6 25 9 25 6 25 3 4 6 8 1 8 5 8 1 8 5 8 2 3 12 18 7 18 5 18 7 18 5 18 6 11 12 22 3 22 9 22 3 22 9 22 4 7 8 14 5 14 3 14 5 14 3 14 8 13 16 26 7 26 9 26 7 26 9 26 2 5 4 10 3 10 1 10 3 10 1 10 13 21 5 21 8 21 5 21 8 21 9 11 4 11 5 11 4 11 5 11 6 7 5 7 1 7 5 7 1 7 7 25 1 25 6 25 1 25 6 25 23 31 14 31 9 31 14 31 9 31 13 15 2 15 11 15 2 15 11 15 8 29 4 29 4 29 4 29 4 29 8 9 7 9 1 9 7 9 1 9 8 13 6 13 2 13 6 13 2 13 ① -5 ② 4 ③ -8 ④ 2 ⑤ -9 ⑥ 11 ⑦ -14 ⑧ -64 ⑨ 80 ⑩ -149 ⑪ -0.5 ⑫ 0.1 ⑬ 0.3 ⑭ -0.2 ⑮ -0.1 � 1.6 � -2.3 � -1.4 � 3.4 � -0.3 � � - � � - � � - � � - � - � -3 6 3 -7 -4 -23 5 36 2 3 35 8 11 34 1 2 33 8 17 32 31 4 13 1 4 3 8 4 7 1 4 1 3 3 13 1 9 3 11 1 7 ① 4-9=-(9-4)=-5 ② 5-1=4 ③ 2-10=-(10-2)=-8 ④ 8-6=2 ⑤ 7-16=-(16-7)=-9 ⑥ 23-12=11 ⑦ 49-63=-(63-49)=-14 ⑧ 34-98=-(98-34)=-64 ⑨ 100-20=80 ⑩ 107-256=-(256-107)=-149 ⑪ 0.1-0.6=-(0.6-0.1)=-0.5 ⑫ 0.2-0.1=0.1 ⑬ 0.6-0.3=0.3 ⑭ 0.3-0.5=-(0.5-0.3)=-0.2 ⑮ 0.2-0.3=-(0.3-0.2)=-0.1 � 3.8-2.2=1.6 � 6.5-8.8=-(8.8-6.5)=-2.3 � 3.3-4.7=-(4.7-3.3)=-1.4 � 4.6-1.2=3.4 � 5.5-5.8=-(5.8-5.5)=-0.3 � - = � - =-& - *=-� - = � - =-& - *=-� - = = � - & - * =-� - = =4 7 8 14 3 14 11 14 1 4 2 8 1 8 3 8 3 8 1 8 1 3 3 9 4 9 7 9 3 13 9 13 12 13 12 13 9 13 1 9 1 9 2 9 3 11 6 11 9 11 9 11 6 11 1 7 3 7 4 7 <풀이>

(11)

� - =-& - *=- =-� 2-2 =-&2 -2

)

=-� -3 =-&3 - *=-3 6 - =6 4 -1 =3 -8=-&8-

)

=-&7 - *=-7 -5 =-&5 -

)

=-&4 - *=-4 1 - = - = = 2 -5 =-&5 -2

)

=-&4 -2

)

=-2 =-23 5 6 10 7 10 13 10 7 10 3 10 3 10 7 10 36 2 3 8 12 5 12 13 12 5 12 1 12 35 8 11 7 11 15 11 7 11 4 11 4 11 7 11 34 1 2 1 2 2 2 1 2 1 2 33 8 17 2 17 10 17 32 4 5 4 5 31 4 13 7 13 11 13 11 13 7 13 1 4 1 4 1 4 3 8 6 16 9 16 15 16 15 16 9 16 ⑦ 6-5=1 ⑧ 70-120=-(120-70)=-50 ⑨ 8-10=-(10-8)=-2 ⑩ 36-15=21 ⑪ 3-0.6=2.4 ⑫ 0.4-5.7=-(5.7-0.4)=-5.3 ⑬ 3.2-0.6=2.6 ⑭ 4.5-4=0.5 ⑮ 2.3-8.9=-(8.9-2.3)=-6.6 � 0.3-2=-(2-0.3)=-1.7 � 7-1.4=5.6 � 0.6-0.8=-(0.8-0.6)=-0.2 � 3.5-7.4=-(7.4-3.5)=-3.9 � 3.52-0.41=3.11 � 5- =4 - =4 � 3 -3 =-&3 -3

)

=- =-� - = � -10=-&10- *=-&9 - *=-9 � - =-& - *=-� 5 - =4 - =4 � - = = � -1 =-&1 - *=-& - *=-� - & - * =-� 4 - =4 7 -5 =6 -5 =1 =1 2 -6=-&6-2 *=-&5 -2 *=-3 6 -6 =-&6 -6 *=-7-3 =6 -3 =3 -5 =-&5 - *=-5 =-5 1 -4 =-&4 -1 * =-&3 -1 * =-2 =-24 5 16 20 7 20 23 20 7 20 3 20 3 20 7 20 36 2 7 4 14 9 14 13 14 13 14 9 14 35 2 5 3 5 5 5 3 5 34 2 5 2 5 4 5 4 5 2 5 33 1 4 3 4 4 4 3 4 3 4 32 5 6 10 12 7 12 17 12 7 12 5 12 31 5 17 6 17 11 17 1 3 3 9 5 9 8 9 8 9 5 9 6 7 5 7 11 7 5 7 4 7 4 7 5 7 3 4 6 8 1 8 7 8 9 11 7 11 16 11 7 11 5 11 4 21 4 21 8 21 8 21 4 21 1 6 5 6 6 6 5 6 5 6 4 13 6 13 10 13 3 5 6 10 3 10 9 10 9 10 3 10 2 3 1 3 3 3 1 3 ① -4 ② -7 ③ 27 ④ -1 ⑤ 170 ⑥ -17 ⑦ 1 ⑧ -50 ⑨ -2 ⑩ 21 ⑪ 2.4 ⑫ -5.3 ⑬ 2.6 ⑭ 0.5 ⑮ -6.6 � -1.7 � 5.6 � -0.2 � -3.9 � 3.11 � 4 � - � � -9 � -� 4 � � - � - � 4 1 -3 - 3 -5 -24 5 36 2 7 35 2 5 34 2 5 33 1 4 32 5 6 31 5 17 1 3 6 7 3 4 9 11 4 21 1 6 4 13 3 5 2 3 <풀이> ※ 여기 16a부터 30b까지는 암산으로 계산을 하여 답을 써야 한다. 다음의 풀이는 암산이 안 되는 학생들을 위하여 써 놓은 것이므로, 계산 과정을 참조하여 답만 쓰도록 한다. ① 5-9=-(9-5)=-4 ② 4-11=-(11-4)=-7 ③ 55-28=27 ④ 7-8=-(8-7)=-1 ⑤ 450-280=170 ⑥ 23-40=-(40-23)=-17

(12)

� - + =-& - *=- =-� -1+ =-&1- & - *=-� - +3 =+&3 - *=3 -6 + =-&6 - *=-6 -2 +2 =+&2 -2 *= - +5=+&5- *=&4 - *=4 -1 + =-&1 - *=-& - *=--5 +3 =-&5 -3 *=-&4 -3 * =-1 =-1 -1 +8 =+&8 -1 *=+&7 -1 * =6 =63 4 12 16 9 16 21 16 9 16 5 16 5 16 9 16 36 4 5 16 20 11 20 27 20 11 20 7 20 11 20 7 20 35 14 15 2 15 16 15 2 15 1 15 2 15 1 15 34 1 4 3 4 4 4 3 4 3 4 33 5 19 3 19 8 19 8 19 3 19 32 2 13 9 13 11 13 9 13 11 13 31 3 7 2 7 5 7 5 7 2 7 2 3 1 3 3 3 1 3 1 3 3 7 6 14 3 14 9 14 3 14 9 14 ① 1 ② -5 ③ -4 ④ 2 ⑤ -8 ⑥ 32 ⑦ -40 ⑧ 52 ⑨ -50 ⑩ -158 ⑪ 0.2 ⑫ -0.1 ⑬ 0.3 ⑭ -0.5 ⑮ -0.4 � 2.2 � -3.2 � 5.2 � -6.6 � 1.2 � - � � - � � -� � � - � - � 3 -6 4 - -1 63 4 36 4 5 35 14 15 34 1 4 33 5 19 32 2 13 31 3 7 2 3 3 7 3 5 1 2 1 4 5 9 1 7 6 11 3 5 <풀이> ① -6+7=+(7-6)=1 ② -10+5=-(10-5)=-5 ③ -8+4=-(8-4)=-4 ④ -1+3=+(3-1)=2 ⑤ -14+6=-(14-6)=-8 ⑥ -15+47=+(47-15)=32 ⑦ -62+22=-(62-22)=-40 ⑧ -38+90=+(90-38)=52 ⑨ -120+70=-(120-70)=-50 ⑩ -309+151=-(309-151)=-158 ⑪ -0.4+0.6=+(0.6-0.4)=0.2 ⑫ -0.9+0.8=-(0.9-0.8)=-0.1 ⑬ -0.4+0.7=+(0.7-0.4)=0.3 ⑭ -0.8+0.3=-(0.8-0.3)=-0.5 ⑮ -0.5+0.1=-(0.5-0.1)=-0.4 � -5.2+7.4=+(7.4-5.2)=2.2 � -8.9+5.7=-(8.9-5.7)=-3.2 � -1.6+6.8=+(6.8-1.6)=5.2 � -9.8+3.2=-(9.8-3.2)=-6.6 � -3.3+4.5=+(4.5-3.3)=1.2 � - + =-& -

)

=-� - + =+& - *= � - + =-& -

)

=-� - + =+& - *= � - + & - * =-� - + =+& - *= = � - + =+& - *= =3 5 6 10 1 10 7 10 7 10 1 10 1 2 6 12 5 12 11 12 11 12 5 12 1 4 2 8 5 8 7 8 5 8 7 8 5 9 2 9 7 9 7 9 2 9 1 7 5 7 6 7 5 7 6 7 6 11 3 11 9 11 9 11 3 11 3 5 1 5 4 5 1 5 4 5 ① -1 ② 11 ③ -4 ④ -378 ⑤ 7 ⑥ -3 ⑦ 4 ⑧ 8 ⑨ -223 ⑩ -57 ⑪ 3.4 ⑫ -0.7 ⑬ 3.3 ⑭ 0.6 ⑮ -8.7 � 0.6 � -6.1 � 4.9 � 6.6 �-0.32 � -3 � 7 � � -4 � -2 � � 3 � - � - � -3 2 -4 2 -42 3 36 5 17 35 4 5 34 1 3 33 4 11 32 8 9 31 1 2 9 10 4 7 1 11 5 6 1 2 1 2 1 2 12 13 1 7 <풀이> ① -8+7=-(8-7)=-1 ② -14+25=+(25-14)=11 ③ -6+2=-(6-2)=-4 ④ -526+148=-(526-148)=-378 ⑤ -9+16=+(16-9)=7 ⑥ -4+1=-(4-1)=-3 ⑦ -48+52=+(52-48)=4 ⑧ -1+9=+(9-1)=8 ⑨ -357+134=-(357-134)=-223

(13)

① -10 ② -6 ③ -8 ④ -16 ⑤ -17 ⑥ -95 ⑦ -67 ⑧ -65 ⑨ -180 ⑩ -300 ⑪ -0.3 ⑫ -0.6 ⑬ -0.9 ⑭ -0.5 ⑮ -0.7 � -7.9 � -4.7 � -9.9 � -8.8 � -5.9 � - � - � - � - � -� - � - � - � -3 � -7 -1 -7 -1 -5 -3 -32 3 36 35 5 11 34 2 9 33 2 9 32 13 17 31 3 8 1 4 8 9 1 2 3 7 3 5 11 13 8 15 6 11 5 7 ⑩ -93+36=-(93-36)=-57 ⑪ -4+7.4=+(7.4-4)=3.4 ⑫ -1.3+0.6=-(1.3-0.6)=-0.7 ⑬ -0.5+3.8=+(3.8-0.5)=3.3 ⑭ -1.4+2=+(2-1.4)=0.6 ⑮ -9+0.3=-(9-0.3)=-8.7 � -0.3+0.9=+(0.9-0.3)=0.6 � -7.9+1.8=-(7.9-1.8)=-6.1 � -3.2+8.1=+(8.1-3.2)=4.9 � -0.4+7=+(7-0.4)=6.6 � -2.88+2.56=-(2.88-2.56)=-0.32 � -5 +2 =-&5 -2

)

=-3 � - +8 =+&8 - *=+&7 - *=7 � - + =+& - *= = � -9 +4 =-&9 -4 *=-&8 -4 * =-4 =-4 � -10+7 =-&10-7 *=-&9 -7 *=-2 � - +1=+&1- *=+& - *= � - +3 =+&3 - *=3 =3 � - + =-& - *=- =-� -1 + =-&1 - *=-& - * =- =-� -3 + =-&3 - *=-3 =-3 -3 +6 =+&6 -3 *=+&5 -3 *=2 - + =+& - *= -5+ =-&5- *=-&4 - *=-4 -1 +3 =+&3 -1 *=2 =2 - + =-& - *=-- +5 =+&5 - *=+&4 - * =4 =42 3 12 18 11 18 23 18 11 18 5 18 5 18 11 18 36 5 17 11 17 16 17 11 17 16 17 35 4 5 8 10 1 10 9 10 9 10 1 10 34 1 3 2 3 3 3 2 3 2 3 33 4 11 2 11 6 11 6 11 2 11 32 8 9 5 9 13 9 5 9 4 9 4 9 5 9 31 1 2 4 8 3 8 7 8 3 8 7 8 9 10 18 20 11 20 29 20 11 20 9 20 11 20 9 20 4 7 8 14 5 14 13 14 5 14 13 14 1 11 2 22 5 22 7 22 7 22 5 22 5 6 1 6 6 6 1 6 1 6 1 2 1 2 2 2 1 2 1 2 1 2 6 12 7 12 13 12 7 12 1 12 7 12 1 12 1 2 8 16 7 16 15 16 15 16 7 16 12 13 2 13 14 13 2 13 1 13 1 13 2 13 1 7 2 7 3 7 2 7 3 7 <풀이> ① -8-2=-(8+2)=-10 ② -3-3=-(3+3)=-6 ③ -7-1=-(7+1)=-8 ④ -9-7=-(9+7)=-16 ⑤ -12-5=-(12+5)=-17 ⑥ -36-59=-(36+59)=-95 ⑦ -43-24=-(43+24)=-67 ⑧ -18-47=-(18+47)=-65 ⑨ -50-130=-(50+130)=-180 ⑩ -136-164=-(136+164)=-300 ⑪ -0.1-0.2=-(0.1+0.2)=-0.3 ⑫ -0.3-0.3=-(0.3+0.3)=-0.6 ⑬ -0.4-0.5=-(0.4+0.5)=-0.9 ⑭ -0.3-0.2=-(0.3+0.2)=-0.5 ⑮ -0.4-0.3=-(0.4+0.3)=-0.7 � -5.4-2.5=-(5.4+2.5)=-7.9 � -1.4-3.3=-(1.4+3.3)=-4.7 � -4.8-5.1=-(4.8+5.1)=-9.9 � -7.5-1.3=-(7.5+1.3)=-8.8 � -3.2-2.7=-(3.2+2.7)=-5.9 � - - =-& +

)

=-� - - =-& + *=-� - - =-& + *=-� - - =-& + *=-� - - =-& + *=- =-� - - =-& + *=- =-� - - =-& + *=- =-1 2 4 8 1 8 3 8 1 8 3 8 3 7 6 14 5 14 1 14 5 14 1 14 3 5 6 10 3 10 3 10 3 10 3 10 11 13 4 13 7 13 4 13 7 13 8 15 4 15 4 15 4 15 4 15 6 11 2 11 4 11 2 11 4 11 5 7 4 7 1 7 4 7 1 7

(14)

① -9 ② -57 ③ -12 ④ -200 ⑤ -16 ⑥ -76 ⑦ -20 ⑧ -7 ⑨ -100 ⑩ -412 ⑪ -1 ⑫ -9.2 ⑬ -8.5 ⑭ -4.5 ⑮ -2.9 �-6.5 � -3.8 � -5.9 � -5 � -3.59 � - � -3 � -8 � -4 � -1 � -1 � -8 � -4 � -6 � -9 -1 -6 -7 -5 --92 3 36 13 19 35 3 5 34 3 4 33 2 3 32 5 9 31 2 5 3 4 6 7 2 11 1 3 1 2 5 6 1 7 1 2 <풀이> ① -5-4=-(5+4)=-9 ② -21-36=-(21+36)=-57 ③ -9-3=-(9+3)=-12 ④ -160-40=-(160+40)=-200 ⑤ -8-8=-(8+8)=-16 ⑥ -49-27=-(49+27)=-76 ⑦ -7-13=-(7+13)=-20 ⑧ -1-6=-(1+6)=-7 ⑨ -75-25=-(75+25)=-100 ⑩ -278-134=-(278+134)=-412 ⑪ -0.4-0.6=-(0.4+0.6)=-1.0 ⑫ -6-3.2=-(6+3.2)=-9.2 ⑬ -2.8-5.7=-(2.8+5.7)=-8.5 � - - =-& + *=- =-� -3- =-&3+ *=-3 � -2 -5=-&2 +5*=-7 - -1 =-& +1 *=-1 -3 -4 =-&3 +4 *=-7 - - =-& + *=- =-1 -5 - =-&5 + *=-5 - -2 =-& +2 *=-2 =-3 -1 -1 =-&1 +1 *=-2 =-2 =-32 3 5 3 15 9 7 9 8 9 7 9 8 9 36 5 5 2 5 3 5 2 5 3 5 35 5 11 3 11 2 11 3 11 2 11 34 2 9 11 9 4 9 7 9 4 9 7 9 33 2 9 1 9 1 9 1 9 1 9 32 13 17 9 17 4 17 9 17 4 17 31 3 8 3 8 3 8 1 4 1 4 1 4 8 9 16 18 11 18 5 18 11 18 5 18 ⑭ -0.3-4.2=-(0.3+4.2)=-4.5 ⑮ -1.4-1.5=-(1.4+1.5)=-2.9 � -2.5-4=-(2.5+4)=-6.5 � -3-0.8=-(3+0.8)=-3.8 � -0.9-5=-(0.9+5)=-5.9 � -4.7-0.3=-(4.7+0.3)=-5.0 � -0.57-3.02=-(0.57+3.02)=-3.59 � - - & + * =-� - -2 =-& +2 *=-2 =-3 � - -8=-& +8*=-8 � - -3 =-& +3 *=-3 =-3 =-4 � - - =-& + *=- =-1 � - - =-& + *=- =- =-1 � -1 -6 =-&1 +6 *=-7 =-8 � -2 -2 =-&2 +2 *=-4 =-4 � - -5 =-& +5 *=-5 =-5 =-6 � -9- =-&9+ *=-9 - - =-& + *=- =-1 -6 - =-&6 + *=-6 =-6 -4-3 =-&4+3 *=-7 -3 -1 =-&3 +1 *=-4 =-4 =-5 - - =-& + *=--5 -4=-&5 +4*=-92 3 2 3 2 3 36 13 19 10 19 3 19 10 19 3 19 35 3 5 8 5 16 10 7 10 9 10 7 10 9 10 34 3 4 3 4 3 4 33 2 3 10 15 2 15 8 15 2 15 8 15 32 5 9 14 9 7 9 7 9 7 9 7 9 31 2 5 2 5 2 5 3 4 7 4 14 8 7 8 7 8 7 8 7 8 6 7 12 14 9 14 3 14 9 14 3 14 2 11 13 11 4 11 9 11 4 11 9 11 1 3 4 3 24 18 11 18 13 18 11 18 13 18 8 8 5 8 3 8 5 8 3 8 1 2 3 2 18 12 11 12 7 12 11 12 7 12 5 6 5 6 5 6 1 7 8 7 2 7 6 7 2 7 6 7 1 2 2 4 1 4 1 4 1 4 1 4 ① 8 ② -2 ③ 2 ④ -8 ⑤ 10 ⑥ 4 ⑦ -4 ⑧ -10 ⑨ 14 ⑩ -2 ⑪ 2 ⑫ -14 ⑬ 19 ⑭ 11 ⑮ -11 � -19 � 26 � -8 � 8 � -26

(15)

- + =-& - *=-- - =-& + *=-+ = - =-& - *=-- + =+& - *= - - =-& + *=-14 17 8 17 6 17 8 17 6 17 36 2 17 6 17 8 17 8 17 6 17 35 2 17 6 17 8 17 8 17 6 17 34 14 17 8 17 6 17 33 12 13 5 13 7 13 5 13 7 13 32 2 13 5 13 7 13 5 13 7 13 31 ① -13 ② -75 ③ 13 ④ -75 ⑤ 88 ⑥ -42 ⑦ -42 ⑧ -88 ⑨ -38 ⑩ -76 ⑪ 76 ⑫ -38 ⑬ 130 ⑭ 12 ⑮ 12 � -130 � 0.2 � -1.4 � 1.4 � 0.2 � � -1 � - � -1 � � � � - � -2 � -3 3 -2 7 3 3 -75 8 36 1 4 35 1 4 34 5 8 33 1 6 32 5 6 31 5 6 1 6 6 7 1 7 1 7 6 7 2 13 5 13 2 13 5 13 <풀이> ① -44+31=-(44-31)=-13 ② -44-31=-(44+31)=-75 ③ -31+44=+(44-31)=13 ④ -31-44=-(31+44)=-75 ⑤ 23+65=88 ⑥ 23-65=-(65-23)=-42 ⑦ -65+23=-(65-23)=-42 ⑧ -65-23=-(65+23)=-88 ⑨ -57+19=-(57-19)=-38 ⑩ -57-19=-(57+19)=-76 ⑪ 19+57=76 ⑫ 19-57=-(57-19)=-38 ⑬ 59+71=130 ⑭ -59+71=+(71-59)=12 ⑮ 71-59=12 � -71-59=-(71+59)=-130 � 0.8-0.6=0.2 � -0.8-0.6=-(0.8+0.6)=-1.4 � 0.6+0.8=1.4 � � - � � - � � � - � - � � - - --14 17 36 2 17 35 2 17 34 14 17 33 12 13 32 2 13 31 2 13 12 13 7 11 1 11 1 11 7 11 6 7 2 7 2 7 6 7 <풀이> ① 3+5=8 ② 3-5=-(5-3)=-2 ③ -3+5=+(5-3)=2 ④ -3-5=-(3+5)=-8 ⑤ 7+3=10 ⑥ 7-3=4 ⑦ -7+3=-(7-3)=-4 ⑧ -7-3=-(7+3)=-10 ⑨ 6+8=14 ⑩ 6-8=-(8-6)=-2 ⑪ -6+8=+(8-6)=2 ⑫ -6-8=-(6+8)=-14 ⑬ 15+4=19 ⑭ 15-4=11 ⑮ -15+4=-(15-4)=-11 � -15-4=-(15+4)=-19 � 9+17=26 � 9-17=-(17-9)=-8 � -9+17=+(17-9)=8 � -9-17=-(9+17)=-26 � + = � - =-& -

)

=-� - + =+& -

)

= � - - =-& +

)

=-� + = � - = � - + =-& - *=-� - - =-& + *=-� + = � - =2 13 5 13 7 13 12 13 5 13 7 13 7 11 3 11 4 11 3 11 4 11 1 11 3 11 4 11 3 11 4 11 1 11 3 11 4 11 7 11 3 11 4 11 6 7 4 7 2 7 4 7 2 7 2 7 2 7 4 7 4 7 2 7 2 7 2 7 4 7 4 7 2 7 6 7 4 7 2 7

(16)

� -0.6+0.8=+(0.8-0.6)=0.2 � - + =+& - *= � - - =-& + *=- =-1 � - + =-& - *=-� - - =-& + *=- =-1 � + = = � - = = � - + =+& - *= = � - - =-& + *=- =-� -3+ =-&3- *=-&2 - *=-2 � -3- =-&3+ *=-3 +3=3 -3=-&3- *=-&2 - *=-2 2 +5 =7 =7 -2 +5 =+&5 -2 *=3 =3 5 -2 =3 =3 -5 -2 =-&5 +2 *=-7 =-75 8 10 16 3 16 7 16 3 16 7 16 36 1 4 4 16 3 16 7 16 35 1 4 4 16 3 16 7 16 7 16 3 16 34 5 8 10 16 7 16 3 16 33 1 6 5 6 6 6 5 6 5 6 32 5 6 5 6 31 5 6 5 6 5 6 1 6 5 6 6 6 5 6 5 6 6 7 12 14 7 14 5 14 7 14 5 14 1 7 2 14 5 14 7 14 7 14 5 14 1 7 2 14 5 14 7 14 6 7 12 14 5 14 7 14 2 13 15 13 5 13 10 13 5 13 10 13 5 13 5 13 10 13 5 13 10 13 2 13 15 13 10 13 5 13 10 13 5 13 5 13 5 13 10 13 10 13 5 13 ① 5 ② 5 ③ -4 ④ -4 ⑤ -16 ⑥ -16 ⑦ -42 ⑧ -42 ⑨ 15 ⑩ 15 ⑪ -39 ⑫ -39 ⑬ 2.2 ⑭ 2.2 ⑮ -1.4 � -1.4 � -5.9 � -5.9 � -0.43 � -0.43 � - � - � � � -� - � 3 � 3 � -2 � -2 -8 -8 -4 -4 7 10 36 7 10 35 5 9 34 5 9 33 9 17 32 9 17 31 4 15 4 15 2 13 2 13 3 11 3 11 2 7 2 7 1 5 1 5 <풀이> ① 7-2=5 ② -2+7=+(7-2)=5 ③ -9+5=-(9-5)=-4 ④ 5-9=-(9-5)=-4 ⑤ -6-10=-(6+10)=-16 ⑥ -10-6=-(10+6)=-16 ⑦ 14-56=-(56-14)=-42 ⑧ -56+14=-(56-14)=-42 ⑨ -32+47=+(47-32)=15 ⑩ 47-32=15 ⑪ -25-14=-(25+14)=-39 ⑫ -14-25=-(14+25)=-39 ⑬ 7.8-5.6=2.2 ⑭ -5.6+7.8=+(7.8-5.6)=2.2 ⑮ -6.7+5.3=-(6.7-5.3)=-1.4 � 5.3-6.7=-(6.7-5.3)=-1.4 � -2.5-3.4=-(2.5+3.4)=-5.9 � -3.4-2.5=-(3.4+2.5)=-5.9 � 0.26-0.69=-(0.69-0.26)=-0.43 � -0.69+0.26=-(0.69-0.26)=-0.43 � - =-& - � - + =-& - *=-� - + =+& - *= � - = � - - =-& + *=-� - - =-& + *=-� 4 -1 =3 � -1 +4 =+&4 -1 *=3 � -5 +3 =-&5 -3 *=-2 � 3 -5 =-&5 -3 *=-2 -2 -6 =-&2 +6 *=-8 -6 -2 =-&6 +2 *=-8 -5=-&5- *=-&4 - *=-4 -5+ =-&5- *=-&4 - *=-45 9 4 9 9 9 4 9 4 9 34 5 9 4 9 9 9 4 9 4 9 33 9 17 5 17 4 17 5 17 4 17 32 9 17 4 17 5 17 4 17 5 17 31 4 15 7 15 11 15 11 15 7 15 4 15 7 15 11 15 7 15 11 15 2 13 3 13 5 13 5 13 3 13 2 13 3 13 5 13 3 11 1 11 2 11 1 11 2 11 3 11 2 11 1 11 2 11 1 11 2 7 3 7 5 7 2 7 3 7 5 7 5 7 3 7 1 5 2 5 3 5 2 5 3 5 1 5 2 5 3 5 3 5 2 5

(17)

-3 +4=+&4-3 *=+&3 -3 *= 4-3 =3 -3 =7 10 3 10 10 10 3 10 36 7 10 3 10 10 10 3 10 3 10 35 -23-38=-(23+38)=-61 55-20=35 -42+14=-(42-14)=-28 38-41=-(41-38)=-3 75+14=89 -127-6=-(127+6)=-133 -20+449=+(449-20)=429 4-345=-(345-4)=-341 236+34=270 -706+159=-(706-159)=-547 40 39 38 37 36 35 34 33 32 31 ① 6 ② -4 ③ -4 ④ 6 ⑤ -8 ⑥ 13 ⑦ -7 ⑧ 2 ⑨ -12 ⑩ 5 ⑪ -10 ⑫ -3 ⑬ 9 ⑭ 5 ⑮ 3 � -11 � -7 � 15 � 0 � 6 � -6 � 20 � 17 � -23 � 14 � -28 � 85 � -67 � -56 � 21 -61 35 -28 -3 89 -133 37429 38-341 39 270 40-547 36 35 34 33 32 31 <풀이> ① 4+2=6 ② 6-10=-(10-6)=-4 ③ -2-2=-(2+2)=-4 ④ -1+7=+(7-1)=6 ⑤ 0-8=-(8-0)=-8 ⑥ 4+9=13 ⑦ -9+2=-(9-2)=-7 ⑧ 8-6=2 ⑨ -3-9=-(3+9)=-12 ⑩ -5+10=+(10-5)=5 ⑪ -8-2=-(8+2)=-10 ⑫ -4+1=-(4-1)=-3 ⑬ 5+4=9 ⑭ 7-2=5 ⑮ -3+6=+(6-3)=3 � -6-5=-(6+5)=-11 � 2-9=-(9-2)=-7 � 8+7=15 � -5+5=0 � 10-4=6 � 9-15=-(15-9)=-6 � 13+7=20 � -2+19=+(19-2)=17 � -15-8=-(15+8)=-23 � 16-2=14 � -32+4=-(32-4)=-28 � 3+82=85 � 7-74=-(74-7)=-67 � -54-2=-(54+2)=-56 � -4+25=+(25-4)=21 <풀이> ① 0.4+0.1=0.5 ② -0.3+0.2=-(0.3-0.2)=-0.1 ③ 0.8-0.1=0.7 ④ -0.2-0.4=-(0.2+0.4)=-0.6 ⑤ -0.3+0.5=+(0.5-0.3)=0.2 ⑥ 0.2+0.6=0.8 ⑦ 0.1-0.4=-(0.4-0.1)=-0.3 ⑧ -0.3-0.6=-(0.3+0.6)=-0.9 ⑨ -0.1+0.1=0 ⑩ 0.2-0.5=-(0.5-0.2)=-0.3 ⑪ -0.2-0.2=-(0.2+0.2)=-0.4 ⑫ 0.1-0.3=-(0.3-0.1)=-0.2 ⑬ 0.5+0.4=0.9 ⑭ -0.4+0.2=-(0.4-0.2)=-0.2 ⑮ 0.5-0.3=0.2 � -0.1-0.7=-(0.1+0.7)=-0.8 � -0.4+0.3=-(0.4-0.3)=-0.1 � 0.3+0.4=0.7 � 0.5-0.1=0.4 � -0.2+0.7=+(0.7-0.2)=0.5 � 1.9-0.7=1.2 � -0.6-1.5=-(0.6+1.5)=-2.1 � -0.2+1.8=+(1.8-0.2)=1.6 � 1.1+0.9=2.0 ① 0.5 ② -0.1 ③ 0.7 ④ -0.6 ⑤ 0.2 ⑥ 0.8 ⑦ -0.3 ⑧ -0.9 ⑨ 0 ⑩ -0.3 ⑪ -0.4 ⑫ -0.2 ⑬ 0.9 ⑭ -0.2 ⑮ 0.2 � -0.8 � -0.1 � 0.7 � 0.4 � 0.5 � 1.2 � -2.1 � 1.6 � 2 � -0.7 � 5.2 � -6.6 � -1.7 � 9.3 � -5.9 -8.3 5.8 -2.7 2.6 -3.19 -1.24 373.48 382.22 39 0.33 40-4.88 36 35 34 33 32 31

(18)

� 0.6-1.3=-(1.3-0.6)=-0.7 � -1.7+6.9=+(6.9-1.7)=5.2 � -4.3-2.3=-(4.3+2.3)=-6.6 � 3.9-5.6=-(5.6-3.9)=-1.7 � 6.9+2.4=9.3 � -7.8+1.9=-(7.8-1.9)=-5.9 0.7-9=-(9-0.7)=-8.3 5+0.8=5.8 -5+2.3=-(5-2.3)=-2.7 5.6-3=2.6 0.21-3.4=-(3.4-0.21)=-3.19 -1.35+0.11=-(1.35-0.11)=-1.24 0.8+2.68=3.48 2.7-0.48=2.22 -0.12+0.45=+(0.45-0.12)=0.33 -1.29-3.59=-(1.29+3.59)=-4.88 40 39 38 37 36 35 34 33 32 31 ① - ② ③ ④ - ⑤ ⑥ ⑦ - ⑧ - ⑨ - ⑩ -⑪ ⑫ ⑬ - ⑭ - ⑮ -� � � - � � -� � � - � -1 � 2 � -7 � 3 � -3 � -2 � 2 - -47 10 32 1 2 31 4 5 2 11 2 9 1 2 3 5 1 4 1 7 2 5 1 3 3 4 1 3 1 2 5 6 1 3 2 11 8 17 4 13 2 7 13 21 7 9 5 11 1 3 1 7 1 5 5 9 3 11 5 7 6 13 9 19 2 5 <풀이> ① - =-& - *=-② + = ③ - + =+& - *= ④ - - =-& + *=-⑤ - = ⑥ + =5 9 4 9 1 9 3 11 7 11 10 11 5 7 1 7 4 7 1 7 4 7 6 13 5 13 11 13 11 13 5 13 9 19 2 19 7 19 2 5 1 5 3 5 3 5 1 5 ⑦ - + =-& - *=-⑧ - =-& - ⑨ - + =-& - *=-⑩ - - =-& + *=-⑪ - = ⑫ + = ⑬ - + =-& - *=-⑭ - =-& - *=-⑮ - - =-& + *=-� - + =+& - *= � + = = � - + =-& - *=- =-� - = = � - - & + * =-� + = = � - + =+& - *= = � - - =-& + *=- =-� - - =-& + *=- =- =-1 � - +3=+&3- *=+&2 - *=2 � -7- =-&7+ *=-7 � 1 +2=3 � 5 -9=-&9-5 *=-&8 -5 *=-3 � - -1 =-& +1 *=-1 =-2 � 3 - =2 - =2 =2 5 -6 =-&6 -5 *=-&5 -5 *=- =-1 2 4 8 5 8 9 8 5 8 1 8 1 8 5 8 31 4 5 8 10 9 10 17 10 9 10 7 10 2 11 13 11 6 11 7 11 6 11 7 11 2 9 7 9 9 9 7 9 7 9 1 2 1 2 3 5 3 5 3 5 1 4 3 4 4 4 3 4 3 4 1 7 8 7 16 14 11 14 5 14 11 14 5 14 2 5 6 15 2 15 4 15 2 15 4 15 1 3 3 9 5 9 8 9 8 9 5 9 3 4 12 16 5 16 7 16 1 3 3 9 2 9 1 9 2 9 1 9 1 2 4 8 1 8 5 8 5 6 10 12 1 12 11 12 1 12 11 12 1 3 2 6 1 6 1 6 2 11 6 11 8 11 8 11 6 11 8 17 5 17 3 17 5 17 3 17 4 13 4 13 8 13 8 13 4 13 2 7 4 7 6 7 4 7 6 7 13 21 10 21 3 21 7 9 1 9 8 9 5 11 4 11 1 11 4 11 1 11 1 3 1 3 2 3 1 3 2 3 1 7 5 7 6 7 6 7 5 7 1 5 2 5 3 5 2 5 3 5

(19)

� -6 =-&6 - *=-&5 - *=-5 � - + =-& - *=-� - +5=+&5- *=+&4 - *=4 � 5 -3 =2 =2 � - -6=-& +6*=-6 � -1 -1 =-&1 +1 *=-2 =-2 - - =-& + *=- =-+9=9 - = 2 +1 =3 =4 1 -9=-&9-1 *=-&8 -1 *=-7 -6 +6=-&6 -6*=-5 6 5 6 5 6 36 4 7 3 7 7 7 3 7 3 7 35 1 5 6 5 2 5 4 5 34 6 11 2 11 8 11 33 3 8 3 8 32 4 5 8 10 1 10 7 10 1 10 7 10 31 5 8 10 16 7 16 3 16 7 16 3 16 3 4 3 4 3 4 1 4 2 8 5 8 7 8 2 5 3 5 5 5 3 5 3 5 1 5 3 5 4 5 3 5 4 5 4 11 9 11 13 11 9 11 2 11 2 11 9 11 -9 +4 =-&9 -4 *=-&8 -4 * =-4 =-47 10 14 20 13 20 27 20 13 20 7 20 13 20 7 20 32 ① 262 ② 6 ③ -59 ④ -18 ⑤ -8 ⑥ 49 ⑦ -28 ⑧ -11 ⑨ 17 ⑩ -293 ⑪ 3.8 ⑫ 0 ⑬ 0.4 ⑭ 6.13 ⑮ -3.1 � 0.4 � -1.8 � 1.4 � -5.9 � 2.41 � � 1 � 6 � -5 � -5 � - � 4 � 2 � -6 � -2 - 9 4 -7 -5 6 36 4 7 35 1 5 34 6 11 33 3 8 32 4 5 31 5 8 3 4 1 4 2 5 1 5 4 11 5 8 1 3 1 3 4 11 ① -4 ② 27 ③ -95 ④ 15 ⑤ 44 ⑥ -31 ⑦ 608 ⑧ 3 ⑨ -600 ⑩ 59 ⑪-0.8 ⑫ -1.5 ⑬ 0.4 ⑭ 6.1 ⑮ -3.42 � -0.2 � -15.03� -5.2 � 5.7 � -7.8 � - � -3 � 1 � 1 � -1 � � -3 � 5 � -8 � - -5 3 -1 -8 36 2 3 35 1 3 34 2 7 33 1 13 32 3 10 31 1 2 2 7 1 3 2 7 2 3 5 17 2 5 1 6 1 2 1 2 <풀이> ① 242+20=262 ② 8-2=6 ③ -15-44=-(15+44)=-59 ④ 54-72=-(72-54)=-18 ⑤ -13+5=-(13-5)=-8 ⑥ 42+7=49 ⑦ 3-31=-(31-3)=-28 ⑧ -4-7=-(4+7)=-11 ⑨ -30+47=+(47-30)=17 ⑩ 123-416=-(416-123)=-293 ⑪ 4-0.2=3.8 ⑫ -0.9+0.9=0 ⑬ 2.5-2.1=0.4 ⑭ 4.89+1.24=6.13 ⑮ -2.5-0.6=-(2.5+0.6)=-3.1 � 0.8-0.4=0.4 � -6.8+5=-(6.8-5)=-1.8 � 0.5+0.9=1.4 � -3.2-2.7=-(3.2+2.7)=-5.9 � -0.13+2.54=+(2.54-0.13)=2.41 � -4 +4 =+&4 -4 *= � + = =1 � 7- =6 - =6 � -1 -4=-&1 +4*=-55 8 5 8 5 8 1 3 2 3 3 3 2 3 1 3 4 3 2 3 2 3 4 11 6 11 10 11 10 11 6 11 <풀이> ① -9+5=-(9-5)=-4 ② 70-43=27 ③ -66-29=-(66+29)=-95 ④ 8+7=15 ⑤ -21+65=+(65-21)=44 ⑥ -5-26=-(5+26)=-31 ⑦ -27+635=+(635-27)=608 ⑧ 11-8=3

(20)

⑨ -6-594=-(6+594)=-600 ⑩ -9+68=+(68-9)=59 ⑪ -0.2-0.6=-(0.2+0.6)=-0.8 ⑫ -8.7+7.2=-(8.7-7.2)=-1.5 ⑬ 0.94-0.54=0.40 ⑭ -0.9+7=+(7-0.9)=6.1 ⑮ -6.61+3.19=-(6.61-3.19)=-3.42 � 0.7-0.9=-(0.9-0.7)=-0.2 � -10-5.03=-(10+5.03)=-15.03 � -1.3-3.9=-(1.3+3.9)=-5.2 � 3.7+2=5.7 � 0.5-8.3=-(8.3-0.5)=-7.8 � - & - * =-� -3- =-&3+ *=-3 � -5 +6 =+&6 -5 *=1 =1 � 1 - =1 =1 � - - =-& + *=- =-1 � - +1 =+&1 - *=+& - *= = � -4=-&4- *=-&3 - *=-3 � 1 +3 =4 =4 =5 � - -8 =-& +8 *=-8 =-8 � + = = -1+ =-&1- *=-& - *=-2 -7 =-&7 -2 *=-5 +2 =2 =3 3-4 =-&4 -3*=-1 - + =+& - *= = -3 -4 =-&3 +4 *=-7 =-87 7 2 7 5 7 2 7 5 7 36 2 3 6 9 2 9 8 9 8 9 2 9 35 1 3 1 3 1 3 34 2 7 9 7 3 7 6 7 33 1 13 5 13 6 13 6 13 5 13 32 3 10 7 10 10 10 7 10 7 10 31 1 2 6 12 1 12 5 12 2 7 4 14 1 14 3 14 1 14 3 14 1 3 4 3 12 9 7 9 5 9 2 7 5 7 7 7 5 7 5 7 2 3 10 15 7 15 17 15 7 15 2 15 2 15 7 15 5 17 22 17 13 17 9 17 13 17 9 17 2 5 4 10 3 10 7 10 1 6 2 12 5 12 7 12 7 12 5 12 1 2 1 2 1 2 1 2 2 4 1 4 3 4 3 4 1 4 ⑪-6.7 ⑫ 4.7 ⑬ -5.5 ⑭ -2.3 ⑮ -3.9 � -1.68 � -1.1 � -6.62 � 0.3 � 0.5 � 6 � -6 � - � -10 � -3 � 2 � 1 � -4 � - � 4 6 -1 3 -1 -3 -21 3 36 5 7 35 2 3 34 2 3 33 5 6 32 1 3 31 5 9 2 7 1 2 1 2 3 5 4 5 1 4 5 13 4 5 9 10 ① -5 ② 51 ③ 0 ④ 361 ⑤ 84 ⑥ -6 ⑦ -24 ⑧ -505 ⑨ -1 ⑩ -17 <풀이> ① -21+16=-(21-16)=-5 ② 55-4=51 ③ -6+6=0 ④ 368-7=361 ⑤ 68+16=84 ⑥ 1-7=-(7-1)=-6 ⑦ -29+5=-(29-5)=-24 ⑧ -906+401=-(906-401)=-505 ⑨ 38-39=-(39-38)=-1 ⑩ -9-8=-(9+8)=-17 ⑪ 2.4-9.1=-(9.1-2.4)=-6.7 ⑫ 3.5+1.2=4.7 ⑬ -5-0.5=-(5+0.5)=-5.5 ⑭ -2.9+0.6=-(2.9-0.6)=-2.3 ⑮ 6-9.9=-(9.9-6)=-3.9 � -0.92-0.76=-(0.92+0.76)=-1.68 � -0.6-0.5=-(0.6+0.5)=-1.1 � 0.38-7=-(7-0.38)=-6.62 � -0.5+0.8=+(0.8-0.5)=0.3 � -4.8+5.3=+(5.3-4.8)=0.5 � 4+2 =6 � -7 + =-&7 - *=-&6 - *=-6 � - =-& - *=-� -7-3 =-&7+3 *=-10 � -6 +2 =-&6 -2 *=-&5 -2 * =-3 =-3 � 5-2 =4 -2 =2 � + = = =1 � -2 -1 =-&2 +1 *=-3 =-3 =-41 2 3 2 6 4 3 4 3 4 3 4 3 4 1 2 3 2 12 8 5 8 7 8 3 5 2 5 5 5 2 5 4 5 8 10 3 10 11 10 3 10 1 10 3 10 1 10 1 4 1 4 1 4 5 13 4 13 9 13 9 13 4 13 4 5 3 5 7 5 3 5 2 5 3 5 2 5 9 10 9 10

(21)

<풀이> ① -7-7=-(7+7)=-14 ② -232-24=-(232+24)=-256 ③ 27+15=42 ④ -84+8=-(84-8)=-76 ⑤ 19-34=-(34-19)=-15 ⑥ -6+11=+(11-6)=5 ⑦ 8-75=-(75-8)=-67 ⑧ -92+88=-(92-88)=-4 ⑨ -158+465=+(465-158)=307 ⑩ 8-17=-(17-8)=-9 ⑪ -9+0.7=-(9-0.7)=-8.3 ⑫ 0.2+7.8=8.0 ⑬ -0.72+0.26=-(0.72-0.26)=-0.46 ⑭ 5.1-0.4=4.7 � - + =-& - *=-� -2+6 =+&6 -2*=4 3 +3 =6 =6 -2+ =-&2- *=-&1 - *=-1 3 + =3 =3 - - =-& + *=- =- =-1 -2 - =-&2 + *=-2 =-3 1 -4 =-&4 -1 *=-&3 -1 * =-2 =-21 3 2 6 5 6 7 6 5 6 1 6 1 6 5 6 36 5 7 12 7 6 7 6 7 6 7 6 7 35 2 3 5 3 10 6 5 6 5 6 5 6 5 6 34 2 3 6 9 2 9 4 9 33 5 6 1 6 6 6 1 6 1 6 32 1 3 5 15 4 15 1 15 31 5 9 5 9 5 9 2 7 3 7 5 7 3 7 5 7 ⑮ -5.7-2.6=-(5.7+2.6)=-8.3 � 0.9-2=-(2-0.9)=-1.1 � -4+6.3=+(6.3-4)=2.3 � 0.3-0.8=-(0.8-0.3)=-0.5 � -1.6-9=-(1.6+9)=-10.6 � 3.48+1.52=5.00 � -3=-&3- *=-&2 - *=-2 � - +9=+&9- *=+&8 - *=8 � - -3 =-& +3 *=-3 =-3 =-4 � 10+ =10 � - + =+& - *= = � 2-1 =1 -1 = � -3 -7=-&3 +7*=-10 � -7 +9 =+&9 -7 *=+&8 -7 * =1 =1 � + = =1 � -5- =-&5+ *=-5 2 -6=-&6-2 *=-&5 -2 *=-3 -1 + =-&1 - *=-1 =-1 5 -1 =4 -6 +6=-&6 -6*=-+ = = -4 =-&4 - *=-&3 - * =-3 =-32 3 6 9 5 9 11 9 5 9 2 9 2 9 5 9 36 3 4 6 8 3 8 3 8 35 8 11 8 11 8 11 34 4 7 2 7 6 7 33 3 8 6 16 5 16 11 16 5 16 11 16 32 1 6 5 6 6 6 5 6 5 6 31 4 7 4 7 4 7 7 9 16 9 8 9 8 9 2 3 12 18 13 18 25 18 13 18 7 18 7 18 13 18 1 3 1 3 1 3 4 9 5 9 9 9 5 9 1 7 2 14 9 14 11 14 11 14 9 14 2 5 2 5 2 5 7 5 21 15 7 15 14 15 7 15 14 15 1 4 3 4 4 4 3 4 3 4 5 8 3 8 8 8 3 8 3 8 ① -14 ② -256 ③ 42 ④ -76 ⑤ -15 ⑥ 5 ⑦ -67 ⑧ -4 ⑨ 307 ⑩ -9 ⑪ -8.3 ⑫ 8 ⑬ -0.46 ⑭ 4.7 ⑮ -8.3 � -1.1 � 2.3 � -0.5 � -10.6 � 5 � -2 � 8 � -4 � 10 � � � -10 � 1 � 1 � -5 -3 -1 4 --32 3 36 3 4 35 8 11 34 4 7 33 3 8 32 1 6 31 4 7 7 9 2 3 1 3 4 9 1 7 2 5 2 5 1 4 5 8 ① 3, 2, 1 ② 2, 3, 1 ③ ④ - ⑤ ⑥ - ⑦ ⑧ - ⑨ ⑩ -1 10 1 10 1 6 1 6 3 8 3 8 1 30 1 30

(22)

⑪ ⑫ - ⑬ ⑭ - ⑮ � -1 18 1 18 3 20 3 20 1 12 1 12 <풀이> ① - = - = ② - = - =-& - *=-③ - = - = ④ - = - =-& - *=-⑤ - = - = ⑥ - = - =-& - *=-⑦ - = - = ⑧ - = - =-& - *=-⑨ - = - = ⑩ - = - =-& - *=-⑪ - = - = ⑫ - = - =-& - *=-⑬ - = - = ⑭ - = - =-& - *=-⑮ - = - = � - = - =-& - *=-1 18 2 18 3 18 3 18 2 18 1 6 1 9 1 18 2 18 3 18 1 9 1 6 3 20 2 20 5 20 5 20 2 20 1 4 1 10 3 20 2 20 5 20 1 10 1 4 1 12 2 12 3 12 3 12 2 12 1 4 1 6 1 12 2 12 3 12 1 6 1 4 1 10 1 10 2 10 2 10 1 10 1 5 1 10 1 10 1 10 2 10 1 10 1 5 1 6 1 6 2 6 2 6 1 6 1 3 1 6 1 6 1 6 2 6 1 6 1 3 3 8 1 8 4 8 4 8 1 8 1 2 1 8 3 8 1 8 4 8 1 8 1 2 1 30 5 30 6 30 6 30 5 30 1 5 1 6 1 30 5 30 6 30 1 6 1 5 1 6 2 6 3 6 3 6 2 6 1 2 1 3 1 6 2 6 3 6 1 3 1 2 가능하면 -& - *의 과정을 생략한 후, 직접 답을 쓰도록 한다. 2 6 3 6 생략 ⑪ ⑫ - ⑬ - ⑭ ⑮ -�1 6 19 60 11 72 17 36 1 3 5 12 ① ② - ③ - ④ ⑤ -⑥ ⑦ - ⑧ ⑨ ⑩ -3 35 1 14 1 24 17 36 15 28 2 9 5 8 1 4 7 15 1 6 <풀이> ① - = - = ② - = - =-& - *=-③ - = - =-& - *=-④ - = - = ⑤ - = - =-& - *=-⑥ - = - = ⑦ - = - =-& - *=-⑧ - = - = ⑨ - = - = ⑩ - = - =-& - *=-⑪ - = - = ⑫ - = - =-& - *=- =-⑬ - = - =-& - *=-⑭ - = - = ⑮ - = - =-& - *=-� - = - = =1 6 5 30 4 30 9 30 2 15 3 10 19 60 25 60 44 60 44 60 25 60 11 15 5 12 11 72 16 72 27 72 2 9 3 8 17 36 10 36 27 36 27 36 10 36 3 4 5 18 1 3 5 15 4 15 9 15 9 15 4 15 3 5 4 15 5 12 5 12 10 12 5 12 5 6 3 35 7 35 10 35 10 35 7 35 2 7 1 5 1 14 2 14 3 14 1 7 3 14 1 24 14 24 15 24 7 12 5 8 17 36 3 36 20 36 20 36 3 36 5 9 1 12 15 28 6 28 21 28 3 14 3 4 2 9 6 9 8 9 8 9 6 9 8 9 2 3 5 8 2 8 7 8 1 4 7 8 1 4 2 4 3 4 3 4 2 4 3 4 1 2 7 15 5 15 12 15 12 15 5 15 4 5 1 3 1 6 3 6 4 6 1 2 2 3 ① 3, 4, 1 ② 4, 3, 1 ③ ④ - ⑤ ⑥ - ⑦ ⑧ - ⑨ ⑩ -⑪ ⑫ - ⑬ ⑭ - ⑮ � -1 30 1 30 5 28 5 28 1 24 1 24 1 12 1 12 1 8 1 8 1 4 1 4 5 14 5 14

(23)

<풀이> ① - + =- + =+& - *= ② - + =- + =-& - *=-③ - + =- + =+& - *= ④ - + =- + =-& - *=-⑤ - + =- + =+& - *= ⑥ - + =- + =-& - *=-⑦ - + =- + =+& - *= ⑧ - + =- + =-& - *=-⑨ - + =- + =+& - *= ⑩ - + =- + =-& - *=-⑪ - + =- + =+& - *= ⑫ - + =- + =-& - *=-⑬ - + =- + =+& - *= ⑭ - + =- + =-& - *=-⑮ - + =- + =+& - *= � - + =- + =-& - *=-1 30 2 30 3 30 2 30 3 30 1 15 1 10 1 30 2 30 3 30 3 30 2 30 1 10 1 15 5 28 2 28 7 28 2 28 7 28 1 14 1 4 5 28 2 28 7 28 7 28 2 28 1 4 1 14 1 24 3 24 4 24 3 24 4 24 1 8 1 6 1 24 3 24 4 24 4 24 3 24 1 6 1 8 1 12 1 12 2 12 1 12 2 12 1 12 1 6 1 12 1 12 2 12 2 12 1 12 1 6 1 12 1 8 1 8 2 8 1 8 2 8 1 8 1 4 1 8 1 8 2 8 2 8 1 8 1 4 1 8 1 4 1 4 2 4 1 4 2 4 1 4 1 2 1 4 1 4 2 4 2 4 1 4 1 2 1 4 5 14 2 14 7 14 2 14 7 14 1 7 1 2 5 14 2 14 7 14 7 14 2 14 1 2 1 7 1 12 3 12 4 12 3 12 4 12 1 4 1 3 1 12 3 12 4 12 4 12 3 12 1 3 1 4 ① ② - ③ ④ - ⑤ ⑥ - ⑦ ⑧ - ⑨ ⑩ -⑪ ⑫ - ⑬ - ⑭ ⑮ � -1 3 7 24 5 18 1 15 4 9 1 2 2 15 5 36 13 30 11 18 7 12 1 6 3 10 1 8 7 20 19 30 <풀이> ① - + =- + =+& - *= ② - + =- + =-& - *=-③ - + =- + =+& - *= ④ - + =- + =-& - *=-⑤ - + =- + =+& - *= ⑥ - + =- + =-& - *=-⑦ - + =- + =+& - *= ⑧ - + =- + =-& - *=-⑨ - + =- + =+& - *= ⑩ - + =- + =-& - *=-⑪ - + =- + =+& - *= = ⑫ - + =- + =-& - *=-⑬ - + =- + =-& - * =- =-⑭ - + =- + =+& - *= ⑮ - + =- + =+& - *= � - + =- + =-& - *=- =-1 3 2 6 1 6 3 6 1 6 3 6 1 6 1 2 7 24 15 24 22 24 22 24 15 24 11 12 5 8 5 18 9 18 14 18 14 18 9 18 7 9 1 2 1 15 4 60 21 60 25 60 21 60 25 60 7 20 5 12 4 9 2 9 6 9 2 9 6 9 2 9 2 3 1 2 7 14 3 14 10 14 10 14 3 14 5 7 3 14 2 15 10 15 12 15 10 15 12 15 2 3 4 5 5 36 16 36 21 36 21 36 16 36 7 12 4 9 13 30 8 30 21 30 8 30 21 30 4 15 7 10 11 18 4 18 15 18 15 18 4 18 5 6 2 9 7 12 2 12 9 12 2 12 9 12 1 6 3 4 1 6 4 6 5 6 5 6 4 6 5 6 2 3 3 10 4 10 7 10 4 10 7 10 2 5 7 10 1 8 5 8 6 8 6 8 5 8 3 4 5 8 7 20 5 20 12 20 5 20 12 20 1 4 3 5 19 30 5 30 24 30 24 30 5 30 4 5 1 6 ① 5, 3, 8 ② 3, 5, 8 ③ - ④ - ⑤ -⑥ - ⑦ - ⑧ - ⑨ - ⑩ -⑪ - ⑫ - ⑬ - ⑭ - ⑮ -� -3 10 3 4 37 40 13 15 23 33 11 24 8 9 25 28 7 36 7 36 7 30 7 30 3 14 3 14 가능하면 +& - *의 과정을 생략한 후, 직접 답을 쓰도록 한다. 3 12 4 12 생략

(24)

<풀이> ① - - =- - =-& + *=-② - - =- - =-& + *=-③ - - =- - =-& + *=-④ - - =- - =-& + *=-⑤ - - =- - =-& + *=-⑥ - - =- - =-& + *=-⑦ - - =- - =-& + *=-⑧ - - =- - =-& + *=-⑨ - - =- - =-& + ⑩ - - =- - =-& + *=-⑪ - - =- - =-& + *=-⑫ - - =- - =-& + *=-⑬ - - =- - =-& + *=-⑭ - - =- - =-& + *=-⑮ - - =- - =-& + *=- =-� - - =- - =-& + *=- =-3 10 9 30 4 30 5 30 4 30 5 30 2 15 1 6 3 4 9 12 2 12 7 12 2 12 7 12 1 6 7 12 37 40 12 40 25 40 12 40 25 40 3 10 5 8 13 15 1 15 12 15 1 15 12 15 1 15 4 5 23 33 11 33 12 33 11 33 12 33 1 3 4 11 11 24 9 24 2 24 9 24 2 24 3 8 1 12 8 9 2 9 6 9 2 9 6 9 2 9 2 3 25 28 4 28 21 28 4 28 21 28 1 7 3 4 7 36 3 36 4 36 3 36 4 36 1 12 1 9 7 36 4 36 3 36 4 36 3 36 1 9 1 12 7 30 5 30 2 30 5 30 2 30 1 6 1 15 7 30 2 30 5 30 2 30 5 30 1 15 1 6 3 14 1 14 2 14 1 14 2 14 1 14 1 7 3 14 2 14 1 14 2 14 1 14 1 7 1 14 8 15 5 15 3 15 5 15 3 15 1 3 1 5 8 15 3 15 5 15 3 15 5 15 1 5 1 3 가능하면 -& + *의 과정을 생략한 후, 직접 답을 쓰도록 한다. 3 15 5 15 생략 ① ② - ③ ④ - ⑤ ⑥ ⑦ - ⑧ - ⑨ ⑩ -⑪ ⑫ - ⑬ ⑭ ⑮ -� -19 21 16 21 16 21 19 21 19 24 11 24 11 24 19 24 7 8 1 8 1 8 7 8 13 20 3 20 3 20 13 20 <풀이> ① + = + = ② - = - =-& - *=-③ - + =- + =+& - *= ④ - - =- - =-& + *=-⑤ + = + = ⑥ - = - = ⑦ - + =- + =-& - ⑧ - - =- - =-& + *=-⑨ + = + = ⑩ - = - =-& - *=-⑪ - + =- + =+& - *= ⑫ - - =- - =-& + *=-⑬ + = + = = ⑭ - = - = = ⑮ - + =- + =-& - * =- =-� - - =- - =-& + * =- =-19 21 38 42 3 42 35 42 3 42 35 42 1 14 5 6 16 21 32 42 3 42 35 42 3 42 35 42 1 14 5 6 16 21 32 42 3 42 35 42 1 14 5 6 19 21 38 42 3 42 35 42 1 14 5 6 19 24 15 24 4 24 15 24 4 24 5 8 1 6 11 24 4 24 15 24 15 24 4 24 5 8 1 6 11 24 4 24 15 24 15 24 4 24 5 8 1 6 19 24 15 24 4 24 5 8 1 6 7 8 3 8 4 8 3 8 4 8 3 8 1 2 1 8 3 8 4 8 3 8 4 8 3 8 1 2 1 8 3 8 4 8 3 8 1 2 7 8 3 8 4 8 3 8 1 2 13 20 8 20 5 20 8 20 5 20 2 5 1 4 3 20 5 20 8 20 8 20 5 20 2 5 1 4 3 20 5 20 8 20 8 20 5 20 2 5 1 4 13 20 8 20 5 20 2 5 1 4 ① - ② - ③ ④ ⑤ -⑥ - ⑦ ⑧ ⑨ - ⑩ -⑪ - ⑫ - ⑬ - ⑭ - ⑮ � 1 18 1 18 19 45 19 45 5 24 5 24 4 35 4 35 3 10 3 10 21 40 21 40 6 35 6 35 4 21 4 21

(25)

<풀이> ① - = - =-& - *=-② - + =- + =-& - *=-③ - + =- + =+& - *= ④ - = - = ⑤ - - =- - =-& + *=-⑥ - - =- - =-& + *=-⑦ - = - = ⑧ - + =- + =+& - *= ⑨ - + =- + =-& - *=-⑩ - = - =-& - *=-⑪ - - =- - =-& + *=-⑫ - - =- - =-& + *=-⑬ - = - =-& - *=-⑭ - + =- + =-& - *=-⑮ - + =- + =+& - *= � - = - =1 18 14 18 15 18 7 9 5 6 1 18 14 18 15 18 15 18 14 18 5 6 7 9 19 45 6 45 25 45 6 45 25 45 2 15 5 9 19 45 6 45 25 45 25 45 6 45 5 9 2 15 5 24 4 24 1 24 4 24 1 24 1 6 1 24 5 24 1 24 4 24 1 24 4 24 1 24 1 6 4 35 6 35 10 35 10 35 6 35 2 7 6 35 4 35 6 35 10 35 6 35 10 35 6 35 2 7 3 10 1 10 4 10 4 10 1 10 2 5 1 10 3 10 1 10 4 10 1 10 2 5 21 40 5 40 16 40 5 40 16 40 1 8 2 5 21 40 16 40 5 40 16 40 5 40 2 5 1 8 6 35 14 35 20 35 2 5 4 7 6 35 14 35 20 35 20 35 14 35 4 7 2 5 4 21 3 21 7 21 3 21 7 21 1 7 1 3 4 21 3 21 7 21 7 21 3 21 1 3 1 7 ② + = + = ③ - = - = ④ - + =- + =-& - *=-⑤ - = - =-& - *=-⑥ + = + = ⑦ - + =- + =+& - *= ⑧ - - =- - =-& + *=-⑨ - - =- - =-& + *=-⑩ + = + = = ⑪ - + =- + =+& - *= ⑫ - - =- - =-& + * =- =-⑬ + = + = ⑭ - = - =-& - *=- =-⑮ - = - = � - + =- + =-& - * =- =-3 20 9 60 5 60 14 60 5 60 14 60 1 12 7 30 1 48 27 48 28 48 9 16 7 12 5 8 25 40 7 40 32 40 32 40 7 40 4 5 7 40 17 18 14 18 3 18 7 9 1 6 7 15 14 30 5 30 9 30 5 30 9 30 1 6 3 10 3 56 32 56 35 56 35 56 32 56 5 8 4 7 5 6 10 12 9 12 1 12 3 4 1 12 13 18 4 18 9 18 4 18 9 18 2 9 1 2 19 36 10 36 9 36 10 36 9 36 5 18 1 4 3 16 6 16 9 16 9 16 6 16 9 16 3 8 25 36 10 36 15 36 5 18 5 12 2 45 18 45 20 45 20 45 18 45 4 9 2 5 7 90 5 90 12 90 5 90 12 90 1 18 2 15 13 36 15 36 28 36 5 12 7 9 45 56 21 56 24 56 3 8 3 7 ① - ② ③ ④ - ⑤ -⑥ ⑦ ⑧ - ⑨ - ⑩ ⑪ ⑫ - ⑬ ⑭ - ⑮ � -3 20 1 48 5 8 17 18 7 15 3 56 5 6 13 18 19 36 3 16 25 36 2 45 7 90 13 36 45 56 13 15 <풀이> ① - - =- - =-& + *=-13 15 5 15 8 15 5 15 8 15 1 3 8 15 ① 1 ② -5 ③ 5 ④ 8 ⑤ -1 ⑥ 2 ⑦ -1 ⑧ -5 ⑨ -1 ⑩ ⑪ 5 ⑫ -8 ⑬ - ⑭ -4 ⑮ � 31 6 7 20 17 30 7 15 3 10 5 9 4 21 11 12 13 24 1 28 7 15 13 40 13 30 1 4 19 24 5 12 <풀이> ① + = + = =15 12 17 12 9 12 8 12 3 4 2 3

(26)

② -3 -2 =-3 -2 =-&3 +2 * =-5 ③ 6 - =6 - =5 - =5 =5 ④ - +9 =- +9 =+&9 - * =+&8 - *=8 ⑤ 1 -2 =1 -2 =-&2 -1 * =-1 ⑥ 2 + =2 + =2 =2 ⑦ - - =- - =-& + * =- =-1 ⑧ -5 + =-5 + =-&5 - *=-5 ⑨ -2 = -2 =-&2 - * =-&1 - *=-1 ⑩ - + =- + =+& - *= = ⑪ +5 = +5 =5 ⑫ -7 - =-7 - =-&7 + * =-7 =-8 ⑬ -2 +2 =-2 +2 =-&2 -2 * =-⑭ - -4 =- -4 =-& +4 * =-4 ⑮ - = - = � 1 +1 =1 +1 =2 =2 =31 6 7 6 35 30 14 30 21 30 7 15 7 10 7 20 8 20 15 20 2 5 3 4 17 30 8 30 9 30 8 30 9 30 4 15 3 10 7 15 2 15 9 15 2 15 9 15 2 15 3 5 3 10 13 10 8 10 5 10 8 10 5 10 4 5 1 2 5 9 3 9 2 9 1 3 2 9 4 21 8 42 27 42 35 42 35 42 27 42 5 6 9 14 11 12 3 12 14 12 3 12 2 12 2 12 3 12 1 6 1 4 13 24 3 24 16 24 3 24 16 24 1 8 2 3 1 28 29 28 20 28 9 28 20 28 9 28 5 7 9 28 7 15 14 30 9 30 5 30 3 10 1 6 13 40 15 40 28 40 28 40 15 40 7 10 3 8 13 30 25 30 38 30 25 30 8 30 8 30 25 30 4 15 5 6 1 4 3 12 10 12 13 12 10 12 1 12 5 6 1 12 19 24 10 24 9 24 10 24 9 24 5 12 3 8 ① 1 ② -1 ③ -7 ④ -6 ⑤ ⑥ 3 ⑦ -3 ⑧ 4 ⑨ 5 ⑩ -4 ⑪ - ⑫ ⑬ ⑭ -2 ⑮ 3 � -82 25 2 5 3 10 1 2 17 18 7 10 7 10 1 6 11 28 17 90 23 56 1 2 5 6 1 4 11 30 11 20 <풀이> ① 1 + =1 + =1 =1 ② - - =- - =-& + * =- =-1 ③ -7 + =-7 + =-&7 - * =-7 =-7 ④ -4 -2 =-4 -2 =-&4 +2 * =-6 =-6 ⑤ - = - = = ⑥ - +4 =- +4 =+&4 - * =+&3 - *=3 ⑦ - -3 =- -3 =-& +3 * =-3 ⑧ 5 - =5 - =4 - =4 ⑨ 2 +2 =2 +2 =4 =4 =5 ⑩ -4 = -4 =-&4 - * =-4 =-4 ⑪ -4 +3 =-4 +3 =-&4 -3 * =-&3 -3 *=- =-⑫ + = + =17 18 8 18 9 18 4 9 1 2 7 10 21 30 14 30 35 30 14 30 5 30 14 30 5 30 7 15 1 6 7 10 21 30 5 30 26 30 26 30 5 30 13 15 1 6 1 6 7 6 21 18 10 18 11 18 5 9 11 18 11 28 21 28 32 28 21 28 4 28 3 4 1 7 17 90 5 90 12 90 5 90 12 90 1 18 2 15 23 56 40 56 63 56 40 56 7 56 7 56 40 56 1 8 5 7 1 2 3 6 2 6 5 6 1 3 5 6 5 6 10 12 9 12 1 12 9 12 1 12 3 4 1 12 1 4 5 20 7 20 12 20 7 20 12 20 7 20 3 5 11 30 41 30 21 30 20 30 21 30 20 30 7 10 2 3 11 20 33 60 8 60 25 60 2 15 5 12

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⑬ -0.3+ =- + =- + =+& - *= = ⑭ 4.2-6 =4 -6 =4 -6 =-&6 -4 *=-2 ⑮ +2.75= +2 = +2 =2 =2 =3 � -1.33-6 =-1 -6 =-1 -6 =-&1 +6 *=-7 =-7 =-82 25 27 25 108 100 75 100 33 100 75 100 33 100 3 4 33 100 3 4 2 5 7 5 28 20 15 20 13 20 3 4 13 20 13 20 3 10 2 10 5 10 5 10 2 10 1 2 1 5 1 2 1 2 5 10 3 10 8 10 8 10 3 10 4 5 3 10 4 5 ① 7, 16 ② 7, -2 ③ 8 ④ -10 ⑤ 10 ⑥ -8 ⑦ 2 ⑧ -16 ⑨ -1 ⑩ -5 ⑪ 5 ⑫ 1 ⑬ 2 ⑭ -6 ⑮ -2 � -12 � 10 � -2 � -4 � -16 <풀이> ※ 덧셈과 뺄셈이 섞여 있는 식은 앞에서부터 차례대로 계산한다. ① 3+4+9=7+9=16 ② 3+4-9=7-9=-2 ③ 3-4+9=-1+9=8 ④ 3-4-9=-1-9=-10 ⑤ -3+4+9=1+9=10 ⑥ -3+4-9=1-9=-8 ⑦ -3-4+9=-7+9=2 ⑧ -3-4-9=-7-9=-16 ⑨ 5+2-8=7-8=-1 ⑩ 5-2-8=3-8=-5 ⑪ -5+2+8=-3+8=5 ⑫ -5-2+8=-7+8=1 ⑬ 3-5+4=-2+4=2 ⑭ 3-5-4=-2-4=-6 ⑮ -3+5-4=2-4=-2 � -3-5-4=-8-4=-12 � 7+6-3=13-3=10 � 7-6-3=1-3=-2 � -7+6-3=-1-3=-4 � -7-6-3=-13-3=-16 ① 5, 2 ② 3, 4 ③ -1 ④ 1 ⑤ -⑥ ⑦ -1 ⑧ 1 ⑨ - ⑩ -⑪ - ⑫ - ⑬ 1 ⑭ ⑮ -11 3 2 5 1 15 2 15 6 7 4 7 2 7 5 7 1 3 2 9 4 9 1 9 1 9 <풀이> ① + - = - =-② - + =- + = ③ - - =- - =- =-1 ④ - + + = + = =1 ⑤ - + - = - =-⑥ - - + =- + = ⑦ - - - =- - =- =- =-1 ⑧ + + = + = =1 ⑨ - - = - ⑩ - + - - ⑪ - - + + =-⑫ + - = - =-⑬ - + = + = =1 ⑭ - + + =- + = = ⑮ - - - =- - =- =- =-11 3 4 3 20 15 11 15 9 15 11 15 2 15 7 15 2 5 6 15 11 15 5 15 11 15 2 15 7 15 1 15 16 15 11 15 5 15 11 15 2 15 7 15 2 15 11 15 9 15 11 15 2 15 7 15 6 7 3 7 9 7 3 7 4 7 5 7 4 7 3 7 1 7 3 7 4 7 5 7 2 7 3 7 1 7 3 7 4 7 5 7 5 7 12 7 3 7 9 7 3 7 4 7 5 7 1 3 4 3 12 9 7 9 5 9 7 9 4 9 1 9 2 9 7 9 5 9 7 9 4 9 1 9 4 9 7 9 3 9 7 9 4 9 1 9 1 9 10 9 7 9 3 9 7 9 4 9 1 9 1 9 10 9 7 9 3 9 7 9 4 9 1 9 4 9 7 9 3 9 7 9 4 9 1 9 2 9 7 9 5 9 7 9 4 9 1 9 ① 3, 6, 4, 9, 4, 5 ② 3, 6, 4, 3, 4, 1 ③ - ④ ⑤ - ⑥ - ⑦ -1 ⑧ ⑨ ⑩ - ⑪ - ⑫ 1 18 19 30 7 30 7 30 19 30 1 12 5 12 1 12 7 12 7 12

(28)

⑬ - ⑭ ⑮ -1 18 5 18 5 18 <풀이> ① + - = + - = - = ② - + = - + =- + = ③ - - = - - =- - =-④ - + + =- + + = + = ⑤ - + - =- + - = - =-⑥ - - + =- - + =- + =-⑦ - - - =- - - =- -=- =-1 ⑧ + + = + + = + = ⑨ - + = - + = + = ⑩ - + - =- + -=- - =-⑪ - - - =- - -=- - =-⑫ + - = + - = - = ⑬ - - = - - = - =-⑭ - + + =- + + =- + = ⑮ - - + =- - + =- + =-1 18 6 18 7 18 6 18 3 18 4 18 1 3 1 6 2 9 5 18 6 18 1 18 6 18 3 18 4 18 1 3 1 6 2 9 5 18 6 18 1 18 6 18 3 18 4 18 1 3 1 6 2 9 1 18 6 18 7 18 6 18 3 18 4 18 1 3 1 6 2 9 19 30 3 30 16 30 3 30 6 30 10 30 1 10 1 5 1 3 7 30 3 30 4 30 3 30 6 30 10 30 1 10 1 5 1 3 7 30 3 30 4 30 3 30 6 30 10 30 1 10 1 5 1 3 19 30 3 30 16 30 3 30 6 30 10 30 1 10 1 5 1 3 1 12 13 12 4 12 9 12 4 12 6 12 3 12 1 3 1 2 1 4 5 12 4 12 9 12 4 12 6 12 3 12 1 3 1 2 1 4 1 12 4 12 3 12 4 12 6 12 3 12 1 3 1 2 1 4 7 12 4 12 3 12 4 12 6 12 3 12 1 3 1 2 1 4 7 12 4 12 3 12 4 12 6 12 3 12 1 3 1 2 1 4 1 12 4 12 3 12 4 12 6 12 3 12 1 3 1 2 1 4 5 12 4 12 9 12 4 12 6 12 3 12 1 3 1 2 1 4 ① -11 ② 2 ③ -19 ④ 0 ⑤ -9 ⑥ 1 ⑦ 3 ⑧ -4 ⑨ -5 ⑩ 2 ⑪ -1 ⑫ ⑬ - ⑭ ⑮ -7 36 1 14 1 2 3 8 2 9 � � - � -113 60 1 3 17 24 <풀이> ① 2-9-4=-7-4=-11 ② -7+4+5=-3+5=2 ③ -6-5-8=-11-8=-19 ④ 3-4+1=-1+1=0 ⑤ -10-4+5=-14+5=-9 ⑥ -3+6-2=3-2=1 ⑦ 2+3-7+5=5-7+5=-2+5=3 ⑧ -2+7-3-6=5-3-6=2-6=-4 ⑨ 7-9+2-5=-2+2-5=0-5=-5 ⑩ -3-2+9-2=-5+9-2=4-2=2 ⑪ - - =- - =- =-1 ⑫ - - + =- + = ⑬ + - = - =- =-⑭ - + + =- + = ⑮ - + = - + =- + =-� - + + =- + + =- + = � - - = - - = -=- =-� - + - =- + - =- -=- =-113 60 73 60 40 60 33 60 40 60 15 60 48 60 2 3 1 4 4 5 1 3 4 12 5 12 1 12 5 12 3 12 4 12 5 12 1 4 1 3 17 24 20 24 3 24 20 24 9 24 12 24 5 6 3 8 1 2 7 36 6 36 13 36 6 36 28 36 15 36 1 6 7 9 5 12 1 14 5 14 4 14 5 14 9 14 13 14 1 2 5 10 9 10 4 10 9 10 1 10 3 10 3 8 7 8 4 8 7 8 3 8 1 8 2 9 11 9 8 9 3 9 8 9 5 9 2 9 ① 4 ② -7 ③ 2 ④ -3 ⑤ -8 ⑥ -19 ⑦ 7 ⑧ -12 ⑨ -11 ⑩ 5 ⑪ ⑫ - ⑬ - ⑭ ⑮ -2 � -6 � 2 � -425 36 3 8 3 8 31 60 1 5 9 20 1 3 5 18 <풀이> ① 7-13+10=-6+10=4 ② -8+16-15=8-15=-7 ③ -13+5+19-9=-8+19-9=11-9=2

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④ 5+8+2-18=13+2-18=15-18=-3 ⑤ -14+8-7+5=-6-7+5=-13+5=-8 ⑥ -13-8-7+9=-21-7+9=-28+9=-19 ⑦ 1-2-3-4+15=-1-3-4+15=-4-4+15 =-8+15=7 ⑧ -5+4+7-10-8=-1+7-10-8=6-10-8 =-4-8=-12 ⑨ -2-9+5+4-15+6=-11+5+4-15+6 =-6+4-15+6 =-2-15+6 =-17+6=-11 ⑩ 12-7-9+20-3-8=5-9+20-3-8 =-4+20-3-8 =16-3-8=13-8=5 ⑪ - + = - + =- + = ⑫ - + - = - =- =-⑬ + -2= + -2= - =-⑭ - - +1 =- - +1 =- + = = ⑮ -3 + + =-3 + + =-3 + =-2 + =-2 � 2-4 -3 =-2 -3 =-2 -3 =-5 =-6 � -1 - +3 =-1 +3 =2 � 2 +1 -8 =2 +1 -8 =3 -8 =3 -7 =-425 36 46 36 21 36 10 36 21 36 10 36 15 36 6 36 5 18 5 12 1 6 3 8 7 8 4 8 7 8 3 8 1 8 3 8 11 8 5 8 6 8 5 8 3 4 5 8 3 4 31 60 45 60 76 60 45 60 16 60 45 60 20 60 36 60 3 4 1 3 3 5 1 5 2 10 15 10 13 10 5 10 7 10 6 10 1 2 7 10 3 5 9 20 40 20 31 20 16 20 15 20 4 5 3 4 1 3 7 21 10 21 3 21 10 21 5 21 2 21 5 18 8 18 3 18 8 18 15 18 12 18 4 9 5 6 2 3 ① -, ② +, ③ - ④ ⑤ ⑥ ⑦ - ⑧ ⑨ - ⑩ -⑪ - ⑫ ⑬ -1 ⑭ - ⑮ -1 �1 5 2 5 1 5 2 5 1 7 5 7 1 7 5 7 7 9 1 3 7 9 1 3 3 5 1 5 3 5 1 5 <풀이> ① +&- *= - = ② -&- *= + = ③ +&- *= - =-& - *=-④ -&- *= + = ⑤ +&- *= - = =1 3 3 9 2 9 5 9 2 9 5 9 3 5 2 5 1 5 2 5 1 5 1 5 1 5 2 5 2 5 1 5 2 5 1 5 3 5 1 5 2 5 1 5 2 5 1 5 1 5 2 5 1 5 2 5 ① -, 3 ② +, 11 ③ -, -3 ④ +, 11 ⑤ 2 ⑥ 14 ⑦ -2 ⑧ 14 ⑨ -,-13 ⑩ +,-3 ⑪ -,-13 ⑫ +, 3 ⑬ -10 ⑭ -4 ⑮ -10 � 4 � -16 � -8 � -16 � 8 <풀이> ※ 괄호를 풀 때에는 +와 -의 부호의 변화에 주의 한다. ① 7+(-4)=7-4=3 ② 7-(-4)=7+4=11 ③ 4+(-7)=4-7=-(7-4)=-3 ④ 4-(-7)=4+7=11 ⑤ 8+(-6)=8-6=2 ⑥ 8-(-6)=8+6=14 ⑦ 6+(-8)=6-8=-(8-6)=-2 ⑧ 6-(-8)=6+8=14 ⑨ -8+(-5)=-8-5=-(8+5)=-13 ⑩ -8-(-5)=-8+5=-(8-5)=-3 ⑪ -5+(-8)=-5-8=-(5+8)=-13 ⑫ -5-(-8)=-5+8=+(8-5)=3 ⑬ -7+(-3)=-7-3=-(7+3)=-10 ⑭ -7-(-3)=-7+3=-(7-3)=-4 ⑮ -3+(-7)=-3-7=-(3+7)=-10 � -3-(-7)=-3+7=+(7-3)=4 � -12+(-4)=-12-4=-(12+4)=-16 � -12-(-4)=-12+4=-(12-4)=-8 � -4+(-12)=-4-12=-(4+12)=-16 � -4-(-12)=-4+12=+(12-4)=8 가능하면 -(7-4)의 과정을 생략한 후, 직접 답을 쓰도록 한다. 생략

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① -1 ② 11 ③ -11 ④ 1 ⑤ 5 ⑥ 13 ⑦ -13 ⑧ -5 ⑨ -7 ⑩ 21 ⑪ -21 ⑫ 7 ⑬ - ⑭ ⑮ -� � � 1 � -1 � -1 5 3 5 3 5 1 5 3 11 9 11 9 11 3 11 <풀이> ① 5+(-6)=5-6=-(6-5)=-1 ② 5-(-6)=5+6=11 ③ -5+(-6)=-5-6=-(5+6)=-11 ④ -5-(-6)=-5+6=+(6-5)=1 ⑤ 9+(-4)=9-4=5 ⑥ 9-(-4)=9+4=13 ⑦ -9+(-4)=-9-4=-(9+4)=-13 ⑧ -9-(-4)=-9+4=-(9-4)=-5 ⑨ 7+(-14)=7-14=-(14-7)=-7 ⑩ 7-(-14)=7+14=21 ⑪ -7+(-14)=-7-14=-(7+14)=-21 ⑫ -7-(-14)=-7+14=+(14-7)=7 ⑬ +&- *= - =-& - *=-⑭ -&- *= + =9 11 6 11 3 11 6 11 3 11 3 11 3 11 6 11 6 11 3 11 6 11 3 11 ⑥ -&- *= + = ⑦ +&- *= - & - * =-⑧ -&- *= + = ⑨ - +&- - =-& + ⑩ - -&- + =-& - ⑪ - +&- - =-& + *=-⑫ - -&- *=- + =+& - *= ⑬ - +&- *=- - =-& + *=- =-1 ⑭ - -&- + =-& - *=-⑮ - +&- *=- - =-& + *=- =-1 � - -&- *=- + =+& - *=1 5 3 5 4 5 4 5 3 5 4 5 3 5 2 5 7 5 4 5 3 5 4 5 3 5 4 5 3 5 1 5 3 5 4 5 3 5 4 5 3 5 4 5 2 5 7 5 3 5 4 5 3 5 4 5 3 5 4 5 1 7 2 7 3 7 3 7 2 7 3 7 2 7 5 7 3 7 2 7 3 7 2 7 3 7 2 7 1 7 2 7 3 7 2 7 3 7 2 7 3 7 5 7 2 7 3 7 2 7 3 7 2 7 3 7 7 9 5 9 2 9 5 9 2 9 1 3 3 9 2 9 5 9 5 9 2 9 5 9 2 9 7 9 2 9 5 9 2 9 5 9 ① -4 ② 5 ③ -5 ④ 9 ⑤ -20 ⑥ -1 ⑦ 17 ⑧ -2 ⑨ -18 ⑩ 0 ⑪ ⑫ 0 ⑬ 1 ⑭ - ⑮ -1 � - � 1 � -3 4 1 2 3 11 3 5 2 9 3 7 <풀이> ① -1+(-3)=-1-3=-(1+3)=-4 ② 10+(-5)=10-5=5 ③ -8-(-3)=-8+3=-(8-3)=-5 ④ 3-(-6)=3+6=9 ⑤ -11+(-9)=-11-9=-(11+9)=-20 ⑥ 4+(-5)=4-5=-(5-4)=-1 ⑦ 9-(-8)=9+8=17 ⑧ 5+(-7)=5-7=-(7-5)=-2 ⑨ -12+(-6)=-12-6=-(12+6)=-18 ⑩ -4-(-4)=-4+4=0 ⑪ +&- *= - = ⑫ - -&- *=- + =0 ⑬ -&- *= + = =1 ⑭ - +&- *=- - =-& + * =- =-⑮ - +&- *=- - =-& + *=- =-16 6 5 6 1 6 5 6 1 6 5 6 1 6 3 5 6 10 3 10 3 10 3 10 3 10 3 10 3 10 2 9 11 9 7 9 4 9 7 9 4 9 3 5 3 5 3 5 3 5 3 7 2 7 5 7 2 7 5 7 ⑮ - +&- *=- - =-& + *=-� - -&- *=- + =+& - *= � +&- *= - = = � -&- *= + = = =1 � - +&- *=- - =-& + * =- =- =-1 � - -&- *=- + =-& - * =- =-1 5 2 10 7 10 9 10 7 10 9 10 7 10 9 10 3 5 8 5 16 10 7 10 9 10 7 10 9 10 7 10 9 10 3 5 8 5 16 10 7 10 9 10 7 10 9 10 1 5 2 10 7 10 9 10 7 10 9 10 3 11 3 11 6 11 6 11 3 11 6 11 3 11 9 11 6 11 3 11 6 11 3 11 6 11 3 11

(31)

� +&- *= - =-& - *=-� -&- *= + = = =1 � - -&- *=- + =-& - *=- =-3 4 6 8 1 8 7 8 1 8 7 8 1 8 7 8 1 2 3 2 6 4 3 4 3 4 3 4 3 4 3 11 2 11 5 11 5 11 2 11 5 11 2 11 � -2 +&-3 *=-2 -3 =-&2 +3 * =-5 =-5 =-61 5 6 5 12 10 9 10 3 10 9 10 3 10 9 10 3 10 ① 12 ② 13 ③ -20 ④ 10 ⑤ 15 ⑥ -43 ⑦ -7 ⑧ -9 ⑨ 12 ⑩ 13 ⑪ 1 ⑫ -2 ⑬ 2 ⑭ -3 ⑮ 6 � - � -1 � -61 5 2 3 5 11 2 3 3 13 1 5 1 4 4 9 <풀이> ① 4-(-8)=4+8=12 ② -6-(-19)=-6+19=+(19-6)=13 ③ -4+(-16)=-4-16=-(4+16)=-20 ④ 15+(-5)=15-5=10 ⑤ 4-(-11)=4+11=15 ⑥ -28+(-15)=-28-15=-(28+15)=-43 ⑦ 6+(-13)=6-13=-(13-6)=-7 ⑧ -18-(-9)=-18+9=-(18-9)=-9 ⑨ 9-(-3)=9+3=12 ⑩ -19-(-32)=-19+32=+(32-19)=13 ⑪ -&- *= + = =1 ⑫ 1 +&-3 *=1 -3 =-&3 -1 * =-2 =-2 ⑬ - -(-3)=- +3=+&3- * =+&2 - *=2 ⑭ -2 +&- *=-2 - =-&2 + * =-2 =-3 ⑮ 2-&-4 *=2+4 =6 � - -&- *=- + =-& - *=-� +&-2 *= -2 =-&2 - * =-&1 - *=-1 =-12 3 8 12 5 12 13 12 5 12 1 12 1 12 5 12 1 12 5 12 5 11 4 11 9 11 4 11 9 11 4 11 9 11 2 3 2 3 2 3 3 13 16 13 7 13 9 13 7 13 9 13 7 13 9 13 1 5 4 5 5 5 4 5 4 5 4 5 1 4 2 8 1 8 3 8 3 8 1 8 3 8 1 8 4 9 13 9 5 9 8 9 5 9 8 9 ① 0.4 ② 0.8 ③ -0.4 ④ 0.8 ⑤ -1.1 ⑥ -0.5 ⑦ -1.1 ⑧ 0.5 ⑨ -0.6 ⑩ 3 ⑪ -3 ⑫ 0.6 ⑬ -1.3 ⑭ 1.1 ⑮ 4.2 � -7 � 8.7 � 4.7 � -0.2 � -10.1 <풀이> ① 0.6+(-0.2)=0.6-0.2=0.4 ② 0.6-(-0.2)=0.6+0.2=0.8 ③ 0.2+(-0.6)=0.2-0.6=-(0.6-0.2)=-0.4 ④ 0.2-(-0.6)=0.2+0.6=0.8 ⑤ -0.8+(-0.3)=-0.8-0.3=-(0.8+0.3)=-1.1 ⑥ -0.8-(-0.3)=-0.8+0.3=-(0.8-0.3)=-0.5 ⑦ -0.3+(-0.8)=-0.3-0.8=-(0.3+0.8)=-1.1 ⑧ -0.3-(-0.8)=-0.3+0.8=+(0.8-0.3)=0.5 ⑨ 1.2+(-1.8)=1.2-1.8=-(1.8-1.2)=-0.6 ⑩ 1.2-(-1.8)=1.2+1.8=3.0 ⑪ -1.2+(-1.8)=-1.2-1.8=-(1.2+1.8)=-3.0 ⑫ -1.2-(-1.8)=-1.2+1.8=+(1.8-1.2)=0.6 ⑬ 2.3+(-3.6)=2.3-3.6=-(3.6-2.3)=-1.3 ⑭ -1.8-(-2.9)=-1.8+2.9=+(2.9-1.8)=1.1 ⑮ 2.7-(-1.5)=2.7+1.5=4.2 � -2.4+(-4.6)=-2.4-4.6=-(2.4+4.6)=-7.0 � 3.6-(-5.1)=3.6+5.1=8.7 � 6.4+(-1.7)=6.4-1.7=4.7 � -1.4-(-1.2)=-1.4+1.2=-(1.4-1.2)=-0.2 � -5.3+(-4.8)=-5.3-4.8=-(5.3+4.8)=-10.1 ① ② ③ - ④ ⑤ -1 ⑥ ⑦ -1 ⑧ - ⑨ ⑩ 1 ⑪ -1 ⑫ - ⑬ - ⑭ ⑮ -�17 30 5 6 5 6 17 30 1 2 1 6 1 6 1 2 1 8 3 8 1 8 3 8 11 12 5 12 11 12 5 12

(32)

<풀이> ① +&- *= - = - = ② -&- *= + = + = ③ +&- *= - = - =-& - *=-④ -&- *= + = + = ⑤ +& *= = -=-& + *=- =-1 ⑥ - -&- *=- + =- + =+& - *= ⑦ +& *= = -=-& + *=- =-1 ⑧ - -&- *=- + =- + =-& - *=-⑨ +&- *= - = - = = ⑩ -&- *= + = + = =1 ⑪ +& *= = -=-& + *=- =-1 ⑫ - -&- *=- + =- + & - * =-⑬ +&- *= - = -=-& - *=-⑭ -&- *= + = + = = ⑮ - +&- *=- - =- -=-& + *=- =-� - -&- *=- + =- + =+& - *=17 30 4 30 21 30 21 30 4 30 7 10 2 15 7 10 2 15 5 6 25 30 21 30 4 30 21 30 4 30 7 10 2 15 7 10 2 15 5 6 25 30 21 30 4 30 7 10 2 15 7 10 2 15 17 30 4 30 21 30 21 30 4 30 7 10 2 15 7 10 2 15 1 2 3 6 2 6 5 6 2 6 5 6 1 3 5 6 1 3 5 6 1 6 7 6 2 6 5 6 2 6 5 6 1 3 5 6 1 3 5 6 1 6 7 6 2 6 5 6 1 3 5 6 1 3 5 6 1 2 3 6 2 6 5 6 1 3 5 6 1 3 5 6 1 8 5 8 6 8 5 8 6 8 5 8 3 4 5 8 3 4 3 8 11 8 5 8 6 8 5 8 6 8 5 8 3 4 5 8 3 4 1 8 5 8 6 8 6 8 5 8 3 4 5 8 3 4 5 8 3 8 11 8 6 8 5 8 6 8 5 8 3 4 5 8 3 4 5 8 11 12 8 12 3 12 2 3 1 4 2 3 1 4 5 12 3 12 8 12 8 12 3 12 2 3 1 4 2 3 1 4 11 12 3 12 8 12 1 4 2 3 1 4 2 3 5 12 3 12 8 12 1 4 2 3 1 4 2 3 ① ② 1 ③ - ④ - ⑤ -⑥ 1 ⑦ -1 ⑧ ⑨ 1 ⑩ -2 ⑪ -2 ⑫ -2 ⑬ 3 ⑭ -1 ⑮ � 7 15 2 3 1 2 1 24 1 9 13 20 13 30 1 8 1 6 4 15 1 4 1 4 7 12 1 2 1 6 1 10 <풀이> ① +&- *= - = - = ② -&- *= + = + = =1 ③ - +&- *=- - =- -=-& + *=- =-④ - -&- *=- + =- + =-& - *=-⑤ +&- *= - = - =-& - *=-⑥ -&- *= + = + = = =1 ⑦ - +&- *=- - =- -=-& + * =- =-1 ⑧ - -&- *=- + =- + =+& - *= = ⑨ -&- *= + = + = =1 ⑩ +&-2 *= -2 = -2 =-&2 - *=-2 ⑪ -3 -&- *=-3 + =-3 + =-&3 - *=-&2 - * =-213 20 12 20 25 20 12 20 5 20 12 20 5 20 3 5 1 4 3 5 1 4 13 30 12 30 25 30 25 30 12 30 5 6 2 5 5 6 2 5 1 8 9 8 7 8 2 8 7 8 1 4 7 8 1 4 1 6 5 30 4 30 9 30 9 30 4 30 3 10 2 15 3 10 2 15 4 15 19 15 9 15 10 15 9 15 10 15 3 5 2 3 3 5 2 3 1 4 5 4 15 12 4 12 11 12 1 3 11 12 1 3 11 12 1 4 2 4 3 4 3 4 2 4 3 4 1 2 3 4 1 2 7 12 3 12 10 12 3 12 10 12 1 4 5 6 1 4 5 6 1 2 5 10 2 10 3 10 2 10 3 10 1 5 3 10 1 5 3 10 1 6 7 6 5 6 2 6 5 6 1 3 5 6 1 3 1 10 4 10 5 10 2 5 1 2 2 5 1 2

(33)

⑫ 1 +& *=1 =1 -=-&1 + * =-1 =-2 ⑬ 3 +&- *=3 - =3 - =3 ⑭ - +&- *=- - =- - =-& + * =- =- =-1 ⑮ -&- *= + = + = = � - -&-1 *=- +1 =- +1 =+&1 - *=+& - * = =7 15 14 30 21 30 35 30 21 30 5 30 5 30 21 30 1 6 7 10 1 6 7 10 2 3 10 15 1 15 9 15 1 15 3 5 1 15 3 5 1 2 3 2 9 6 4 6 5 6 4 6 5 6 2 3 5 6 2 3 5 6 1 24 20 24 21 24 5 6 7 8 5 6 7 8 1 9 10 9 3 9 7 9 3 9 7 9 1 3 7 9 1 3 7

9 ⑪-&- *+&- *= - =-& - *

=-⑫ -&- *-&- *= + = = =1

⑬ - +&- *=- - =-& + *

=- =-1

⑭ -&- *+&- *= - =-& -

*=-⑮ - -&- *=- + =+& - * = = � -&- *-&- *= + = = =12 3 5 3 10 6 5 6 5 6 5 6 5 6 2 5 4 10 3 10 7 10 7 10 3 10 7 10 3 10 4 9 4 9 8 9 8 9 4 9 8 9 4 9 3 7 10 7 4 7 6 7 4 7 6 7 4 7 6 7 1 2 3 2 12 8 7 8 5 8 7 8 5 8 1 4 2 8 5 8 7 8 7 8 5 8 7 8 5 8 ① -15 ② -3 ③ 3 ④ 15 ⑤ -13 ⑥ 10 ⑦ 5 ⑧ -8 ⑨ -1 ⑩ ⑪ - ⑫ 1 ⑬ -1 ⑭ - ⑮ � 12 3 2 5 4 9 3 7 1 2 1 4 1 4 1 2 <풀이> ※ 괄호를 풀 때에는 +와 -의 부호의 변화에 주의 한다. ① -9+(-6)=-9-6=-(9+6)=-15 ② -9-(-6)=-9+6=-(9-6)=-3 ③ -(-9)+(-6)=9-6=3 ④ -(-9)-(-6)=9+6=15 ⑤ -7+(-6)=-7-6=-(7+6)=-13 ⑥ -(-6)-(-4)=6+4=10 ⑦ -8-(-13)=-8+13=+(13-8)=5 ⑧ -(-9)+(-17)=9-17=-(17-9)=-8 ⑨ - +&- *=- - =-& + * =- =- =-1 ⑩- -&- *=- + =+& - *= =1 4 2 8 5 8 7 8 7 8 5 8 7 8 5 8 1 2 3 2 12 8 7 8 5 8 7 8 5 8 7 8 5 8 ① -0.8 ② 0.2 ③ -0.2 ④ 0.8 ⑤ -1.3 ⑥ 1.1 ⑦ 0.8 ⑧ -0.8 ⑨ 0.2 ⑩ 1.9 ⑪ - ⑫ ⑬ - ⑭ ⑮ -� � � -5 24 2 3 2 3 20 21 31 40 1 40 1 40 31 40 <풀이> ① -0.3+(-0.5)=-0.3-0.5=-(0.3+0.5)=-0.8 ② -0.3-(-0.5)=-0.3+0.5=+(0.5-0.3)=0.2 ③ -(-0.3)+(-0.5)=0.3-0.5=-(0.5-0.3) =-0.2 ④ -(-0.3)-(-0.5)=0.3+0.5=0.8 ⑤ -0.7+(-0.6)=-0.7-0.6=-(0.7+0.6)=-1.3 ⑥-(-0.9)-(-0.2)=0.9+0.2=1.1 ⑦-0.8-(-1.6)=-0.8+1.6=+(1.6-0.8)=0.8 ⑧-(-0.6)+(-1.4)=0.6-1.4=-(1.4-0.6) =-0.8 ⑨ 0-(-0.2)=0+0.2=0.2 ⑩ -(-1.9)-0=1.9-0=1.9 ⑪ - +&- *=- - =- -=-& + *=-⑫ - -&- *=- + =- + =+& - *=1 40 15 40 16 40 16 40 15 40 2 5 3 8 2 5 3 8 31 40 16 40 15 40 16 40 15 40 2 5 3 8 2 5 3 8

(34)

① 1 ② -1 ③ -2 ④ 6 ⑤ 15 ⑥ -1 ⑦ -15 ⑧ 6 ⑨ -19 ⑩ 13 ⑪ -17 ⑫ -7 ⑬ 2 ⑭ -8 ⑮ -5 � 9 � -10 <풀이> ※ 덧셈과 뺄셈이 혼합된 식의 계산은 괄호를 푼 후, 앞에서부터 차례대로 계산한다. ① -4-3-(-8)=-4-3+8=-7+8=1 ② 6+(-4)-3=6-4-3=2-3=-1 ③ -(-5)-9+2=5-9+2=-4+2=-2 ④ -(-4)+(-5)+7=4-5+7=-1+7=6 ⑤ 8-(-1)-(-6)=8+1+6=9+6=15 ⑥ -(-1)-5-(-3)=1-5+3=-4+3=-1 ⑦ (-5)+(-6)+(-4)=-5-6-4=-11-4=-15 ⑧ -(-2)-(-7)+(-3)=2+7-3=9-3=6 ⑨ 5+(-18)-6=5-18-6=-13-6=-19 ⑬ -&- *+&- *= - = -=-& - *=-⑭ -&- *-&- *= + = + = ⑮ - +&- *=- - =- -=-& + *=-� -&- *-&- *= + = + = = � - -&- *=- + =- + =+& - *= = � -&- *+&- *= - = -=-& - *=-5 24 15 24 20 24 20 24 15 24 5 6 5 8 5 6 5 8 2 3 8 12 1 12 9 12 9 12 1 12 3 4 1 12 3 4 1 12 2 3 4 6 1 6 3 6 1 6 1 2 1 6 1 2 20 21 6 21 14 21 6 21 14 21 2 7 2 3 2 7 2 3 31 40 16 40 15 40 2 5 3 8 2 5 3 8 1 40 15 40 16 40 16 40 15 40 2 5 3 8 2 5 3 8 ① 15 ② -20 ③ 28 ④ -111 ⑤ -0.1 ⑥ -2.5 ⑦ -0.8 ⑧ 1.8 ⑨ -20.8 ⑩ 4.55 ⑪ ⑫ 2 ⑬ -3 ⑭ -2 ⑮ -1 � 7 � 2 � -25 12 2 15 1 15 1 4 5 7 1 2 2 3 <풀이> ① -(-8)-(-7)=8+7=15 ② -6+(-14)=-6-14=-(6+14)=-20 ③ -(-41)+(-13)=41-13=28 ④ -234-(-123)=-234+123=-(234-123)=-111 ⑤ -(-0.2)+(-0.3)=0.2-0.3=-(0.3-0.2)=-0.1 ⑥ -1.7+(-0.8)=-1.7-0.8=-(1.7+0.8)=-2.5 ⑦ -3.4-(-2.6)=-3.4+2.6=-(3.4-2.6)=-0.8 ⑧ -(-1.52)-(-0.28)=1.52+0.28=1.80 ⑨ -4.8+(-16)=-4.8-16=-(4.8+16)=-20.8 ⑩ -(-5)+(-0.45)=5-0.45=4.55 ⑪ - -&- *=- + =+& - *= = ⑫ -&- *-&-1 *= +1 =1 =2 ⑬ -2 +&- *=-2 - =-&2 + * =-2 =-2 =-31 2 3 2 18 12 7 12 11 12 7 12 11 12 7 12 11 12 7 7 3 7 4 7 3 7 4 7 2 3 6 9 2 9 8 9 8 9 2 9 8 9 2 9 ⑭ -&-1 *+&-4 * =1 -4 =-&4 -1 * =-&3 -1 *=-2 =-2 ⑮ - +&- *=- - =- -=-& + *=-=- *=-=-1 � -&-2 *-&-4 *=2 +4 =2 +4 =6 =6 =7 � - -(-2.8)=- +2.8=- +2 =- +2 =+&2 - * =2 � -(-0.75)+&-3 *=0.75-3 = -3 = -3 =-&3 - * =-&2 - *=-25 12 9 12 14 12 9 12 2 12 2 12 9 12 1 6 3 4 1 6 1 6 2 15 10 15 12 15 12 15 10 15 4 5 2 3 2 3 2 3 1 15 16 15 32 30 5 30 27 30 1 6 9 10 1 6 9 10 1 4 5 4 15 12 8 12 7 12 8 12 7 12 2 3 7 12 2 3 7 12 5 7 10 14 9 14 19 14 9 14 5 14 5 14 9 14 5 14 9 14

(35)

① - ② - ③ - ④ 1 ⑤ -1 ⑥ - ⑦ ⑧ -1 ⑨ - ⑩13 45 5 8 5 18 2 3 7 90 1 12 2 3 5 14 2 9 3 10 <풀이> ① - -&- *- =- + -= - =② & *& * = + -= - - =-③ -&- *- +&- *= - -=- - =-④ -&- *-&- *= + + = + = = =12 3 5 3 25 15 4 15 21 15 4 15 8 15 13 15 4 15 8 15 13 15 5 14 3 14 2 14 3 14 13 14 11 14 3 14 13 14 11 14 2 9 8 9 6 9 8 9 2 9 4 9 8 9 2 9 4 9 3 10 9 10 6 10 9 10 7 10 1 10 9 10 7 10 1 10 ⑩ -4-(-2)-(-15)=-4+2+15=-2+15=13 ⑪ -(-15)+(-13)+(-19)=15-13-19 =2-19=-17 ⑫ 5+(-8)+9+(-13)=5-8+9-13 =-3+9-13 =6-13=-7 ⑬ -7+(-4)-(-16)-3=-7-4+16-3 =-11+16-3 =5-3=2 ⑭ -(-11)+(-7)-20-(-8)=11-7-20+8 =4-20+8 =-16+8=-8 ⑮ 4+(-9)-(-8)+7-15=4-9+8+7-15 =-5+8+7-15 =3+7-15=10-15=-5 � -5-(-7)-10+(-3)-(-20) =-5+7-10-3+20=2-10-3+20 =-8-3+20=-11+20=9 � -(-6)-9-(-8)+(-11)+(-4) =6-9+8-11-4=-3+8-11-4 =5-11-4=-6-4=-10

⑤ &- *+&- *-&- *=- - +

=- + =- =-1 ⑥ -&- *+ - = + - = + -= - =-⑦ +&- *-&- *= - + = - + =- + = = ⑧ & *+& * = -=- - -=- - =- =-1 ⑨ -&- *- +&- *= -= - -= - =-

=-⑩ &- *-&- *+&- *=- +

-=- + -= - =13 45 15 45 28 45 15 45 33 45 5 45 1 3 11 15 1 9 1 3 11 15 1 9 5 8 15 24 21 24 6 24 21 24 4 24 10 24 7 8 1 6 5 12 7 8 1 6 5 12 5 18 23 18 8 18 15 18 8 18 9 18 6 18 4 9 1 2 1 3 4 9 1 2 1 3 2 3 8 12 9 12 1 12 9 12 5 12 4 12 3 4 5 12 1 3 3 4 5 12 1 3 7 90 45 90 38 90 45 90 20 90 18 90 1 2 2 9 1 5 1 2 2 9 1 5 1 12 13 12 5 12 18 12 5 12 11 12 7 12 5 12 11 12 7 12 ① -18 ② 16 ③ -27 ④ -13 ⑤ 7 ⑥ -7 ⑦ 3.5 ⑧ -12 ⑨ - ⑩ -⑪ 2 ⑫ 1 ⑬ - ⑭ 57 10 1 4 1 24 11 28 1 2 1 12 <풀이> ① -8-(-20)+(-30)=-8+20-30=12-30=-18 ②-(-12)+(-19)-(-23)=12-19+23=-7+23=16 ③ 15+(-8)+6+(-40)=15-8+6-40=7+6-40 =13-40=-27

(36)

④ -(-6)-(-7)+(-45)+19=6+7-45+19 =13-45+19 =-32+19=-13 ⑤ -9+(-9)-(-30)+(-25)+20 =-9-9+30-25+20=-18+30-25+20 =12-25+20=-13+20=7 ⑥ 13-(-7)+(-29)+18+(-16) =13+7-29+18-16=20-29+18-16 =-9+18-16=9-16=-7 ⑦ -6-(-0.5)-(-17)-8=-6+0.5+17-8 =-5.5+17-8 =11.5-8=3.5 ⑧-(-10)+(-4.5)+(-6)-(-0.5)-12 =10-4.5-6+0.5-12=5.5-6+0.5-12 =-0.5+0.5-12 =0-12=-12 ⑨ - -&- *- =- + - =- + -= - =-⑩ + +&- *= + - = -=- =-⑪ -2+&- *-&-5 *=-2- +5 =-2 +5 =-2 +5 =-2 +4 =2 ⑫ -&-3 *-1 +&- * =3 -1 - =3 -1 -=2 -1 - =1 - =1 ⑬ 1 +(-5)-&-3 *=1 -5+3 =1 -4 +3 =-3 +3 =-

=-⑭ -&-5 *+&-1 *-&-2 *

=5 -1 +2 =5 -1 +2 =4 -1 +2 =3 +2 =5 =57 10 21 30 5 30 16 30 5 30 24 30 40 30 5 30 24 30 10 30 1 6 4 5 1 3 1 6 4 5 1 3 1 4 3 12 7 12 10 12 7 12 12 12 2 12 7 12 1 6 7 12 1 6 1 24 18 24 19 24 18 24 8 24 27 24 18 24 8 24 3 24 3 4 1 3 1 8 3 4 1 3 1 8 11 28 32 28 21 28 4 28 21 28 1 7 3 4 1 7 3 4 1 7 3 4 1 2 5 10 9 10 4 10 9 10 3 10 1 10 9 10 3 10 1 10 1 12 8 12 7 12 8 12 10 12 3 12 2 3 5 6 1 4 2 3 5 6 1 4 ① -5 ② -2 ③ 1.64 ④ 0 ⑤ -7.16 ⑥ 9 ⑦ 2 ⑧ -5 ⑨ 8 ⑩ -51 3 3 40 1 20 2 3 <풀이> ※ 덧셈과 뺄셈이 혼합된 식의 계산은 괄호를 푼 후, 양수는 양수끼리 음수는 음수끼리 계산할 수 도 있다. ① 6+(-2.5)+7+(-15.5)=6-2.5+7-15.5 =6+7-2.5-15.5 =13-18=-5 ② -(-0.3)+(-3)-2-(-2.7)=0.3-3-2+2.7 =0.3+2.7-3-2 =3-5=-2 ③ -5-(-7.04)-(-2.6)+(-3) =-5+7.04+2.6-3=-5-3+7.04+2.6 =-8+9.64=1.64 ④ 4.21+(-2)-(-6.79)+(-6)-3 =4.21-2+6.79-6-3 =4.21+6.79-2-6-3 =11-11=0 ⑤ -4-(-4.5)+(-8)-5-(-5.34) =-4+4.5-8-5+5.34 =-4-8-5+4.5+5.34 =-17+9.84=-7.16 ⑥ -(-9)+(-8)+10+(-6)-(-4) =9-8+10-6+4=9+10+4-8-6 =23-14=9 ⑦ 2 +&- *+ =2 - + =2 - + =2 + - =2 - =2 =2 ⑧ - +2 +&-6 * =- +2 -6 =- +2 -6 =- -6 +2 =-6 +2 =-4 =-5 ⑨ -&-5 *+&- *+3 =5 - +3 =5 - +3 =5 +3 - =8 - =83 40 12 40 15 40 12 40 10 40 5 40 10 40 12 40 5 40 1 4 3 10 1 8 1 4 3 10 1 8 1 20 21 20 8 20 29 20 8 20 14 20 15 20 14 20 8 20 15 20 7 10 2 5 3 4 7 10 2 5 3 4 2 3 8 12 5 12 13 12 5 12 3 12 10 12 3 12 5 12 10 12 1 4 5 12 5 6 1 4 5 12 5 6

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