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2 x 2 = 4
2 x 7 = 14
2 x 3 = 6
2 x 8 = 16
2 x 4 = 8
2 x 9 = 18
a) 8 + 4 = 12 15 – 6 = 9 9 + 2 = 11 6 + 8 = 14
4 + 8 = 12 15 – 9 = 6 11 – 9 = 2 14 – 8 = 6
b)
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c) 42 + 18 – 10 = 60 – 10 = 50
60 – 13 + 23 = 47 + 23 = 70
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a)
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\(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{100}\\{\,\,75}\end{array}}\\\hline{\,\,\,\,\,\,25}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{100}\\{\,\,94}\end{array}}\\\hline{\,\,\,\,\,\,\,\,6}\end{array}\)
Từ phép nhân 2 × 3 = 6; em lập được 2 phép chia tương ứng: 6 : 2 = 3 và
6 : 3 = 2
Từ phép nhân 2 × 6 = 12; em lập được 2 phép chia tương ứng: 12 : 2 = 6 và
12 : 6 = 2
Từ phép nhân 2 × 9 = 18; em lập được 2 phép chia tương ứng: 18 : 2 = 9 và
18 : 9 = 2
Ta có:
9 + 8 = 17 8 + 4 = 12 8 + 8 = 16
9 + 6 = 15 9 + 4 = 13 8 + 6 = 14