Tính nhẩm :
1 × 2 = .... 1 × 3 = ....
2 × 1 = .... 3 × 1 = ....
2 : 1 = .... 3 : 1 = ....
1 × 4 = .... 1 × 5 = .....
4 × 1 = .... 5 × 1 = ....
4 : 1 = ..... 5 : 1 = .....
1 × 1 = ..... 1 : 1 = .....
1 × 2 = 2 1 × 3 = 3
2 × 1 = 2 3 × 1 = 3
2 : 1 = 2 3 : 1 = 3
1 × 4 = 4 1 × 5 = 5
4 × 1 = 4 5 × 1 = 5
4 : 1 = 4 5 : 1 = 5
1 × 1 = 1 1 : 1 = 1
-- Mod Toán 2
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