Выполни деление и сделай проверку умножением:
68 : 2
77 : 7
30 : 2
60 : 5
78 : 3
56 : 4
64 : 2
57 : 3
68 : 2 = (60 + 8) : 2 = 60 : 2 + 8 : 2 = 30 + 4 = 34
Проверка:
34 * 2 = (30 + 4) * 2 = 30 * 2 + 4 * 2 = 60 + 8 = 68
77 : 7 = (70 + 7) : 7 = 70 : 7 + 7 : 7 = 10 + 1 = 11
Проверка:
11 * 7 = (10 + 1) * 7 = 10 * 7 + 1 * 7 = 70 + 7 = 77
30 : 2 = (20 + 10) : 2 = 20 : 2 + 10 : 2 = 10 + 5 = 15
Проверка:
15 * 2 = (10 + 5) * 2 = 10 * 2 + 5 * 2 = 20 + 10 = 30
60 : 5 = (50 + 10) : 5 = 50 : 5 + 10 : 5 = 10 + 2 = 12
Проверка:
12 * 5 = (10 + 2) * 5 = 10 * 5 + 2 * 5 = 50 + 10 = 60
78 : 3 = (60 + 18) : 3 = 60 : 3 + 18 : 3 = 20 + 6 = 26
Проверка:
26 * 3 = (20 + 6) * 3 = 20 * 3 + 6 * 3 = 60 + 18 = 78
56 : 4 = (40 + 16) : 4 = 40 : 4 + 16 : 4 = 10 + 4 = 14
Проверка:
14 * 4 = (10 + 4) * 4 = 10 * 4 + 4 * 4 = 40 + 16 = 56
64 : 2 = (60 + 4) : 2 = 60 : 2 + 4 : 2 = 30 + 2 = 32
Проверка:
32 * 2 = (30 + 2) * 2 = 30 * 2 + 2 * 2 = 60 + 4 = 64
57 : 3 = (30 + 27) : 3 = 30 : 3 + 27 : 3 = 10 + 9 = 19
Проверка:
19 * 3 = (10 + 9) * 3 = 10 * 3 + 9 * 3 = 30 + 27 = 57