Tính nhẩm:
12 − 8 = ..... 12 − 6 = .....
12 − 7 = ..... 12 − 9 = .....
12 − 4 = ..... 12 − 3 = .....
12 − 5 = ..... 12 − 2 = .....
12 − 8 = 4 12 − 6 = 6
12 − 7 = 5 12 − 9 = 3
12 − 4 = 8 12 − 3 = 9
12 − 5 = 7 12 − 2 = 10
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