Tính nhẩm :
2 × 7 = ..... 2 × 8 = .....
14 : 2 = ..... 16 : 2 = .....
2 × 9 = ..... 2 × 10 = .....
18 : 2 = ..... 20 : 2 = .....
2 × 7 = 14 2 × 8 = 16
14 : 2 = 7 16 : 2 = 8
2 × 9 = 18 2 × 10 = 20
18 : 2 = 9 20 : 2 = 10
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