Page 14 - 바빠 교과서 연산_2-1_정답

정답

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53단계 121쪽 다섯째 마당 곱셈
① 54 ② 81 ③ 91 ④ 18 ⑤ 9 55단계 127쪽

⑥ 9 ⑦ 49 ⑧ 32 ⑨ 38 ⑩ 75
① 3 / 4, 6 / 6 ② 4 / 6, 9, 12 / 12
③ 5 / 8, 12, 16, 20 / 20
53단계 122쪽
④ 4 / 12, 18, 24 / 24 ⑤ 3 / 14, 21 / 21
① 70 ② 81 ③ 8 ④ 9 ⑤ 45

⑥ 75 ⑦ 17 ⑧ 29 ⑨ 64 ⑩ 82 55단계 128쪽

① 5 / 5 / 15 ② 4 / 4 / 4, 4, 4, 16
54단계 123쪽
③ 3 / 3 / 6, 6, 18 ④ 3 / 3 / 8, 8, 8, 24
① 17 ② 16 ③ 15 ④ 5, 23 / 23 ⑤ 4 / 4 / 9, 9, 9, 9, 36

54단계 124쪽 56단계 129쪽

① 6 / 3, 6 ② 8 / 4, 8 ③ 10 / 5, 10
④ 12 / 4, 12 ⑤ 15 / 5, 15 ⑥ 18 / 6, 18

① ② ③ ④
56단계 130쪽

① 12 / 3, 12 ② 20 / 5, 20 ③ 28 / 7, 28

④ 20 / 4, 20 ⑤ 30 / 6, 30 ⑥ 40 / 8, 40

57단계 131쪽

29 52 31 32 ① 12 / 2, 12 ② 18 / 3, 18 ③ 24 / 4, 24
④ 21 / 3, 21 ⑤ 28 / 4, 28 ⑥ 35 / 5, 35

57단계 132쪽

① 24 / 3, 24 ② 48 / 6, 48 ③ 64 / 8, 64
④ 36 / 4, 36 ⑤ 54 / 6, 54 ⑥ 72 / 8, 72

152