Tính nhẩm:
6 + 8 = ..... 12 − 7 = .....
13 − 6 = ..... 4 + 9 = .....
7 + 8 = ..... 16 − 9 = .....
9 + 9 = ..... 14 − 6 = .....
6 + 8 = 14 12 − 7 = 5
13 − 6 = 7 4 + 9 = 13
7 + 8 = 15 16 − 9 = 7
9 + 9 = 18 14 − 6 = 8
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