Tính nhẩm: a) 6 × 3 = . . . . . 6 × 2 = . . . . . 6 × 9 = . . . . . 6 × 5 = . . . . . 4 × 6 = . . . . . 6 × 8 = . . . . . 6 × 4 = . . . . . 6 × 1 = . . . . . 6 × 10 = . . . . . 6 × 7 = . . .
Giải thích
a)
6 × 3 = 18 6 × 2 = 12 | 6 × 9 = 54 6 × 5 = 30 | 4 × 6 = 24 6 × 8 = 48 | 6 × 4 = 24 6 × 1 = 6 | 6 × 10 = 60 6 × 7 = 42 |
b)
54 : 6 = 9 36 : 6 = 6 60 : 6 = 10 | 48 : 6 = 8 6 : 6 = 1 18 : 6 = 3 | 12 : 6 = 2 42 : 6 = 7 30 : 6 = 5 | 24 : 4 = 6 24 : 6 = 4 50 : 5 = 10 |