Tính nhẩm: 3 x 3 3 x 7 3 x 6 3 x 4 3 x 1 3 x 9 3 x 10 3 x 8 3 x 2 2 x 3 3 x 5 5 x 3

3 x 3 = 9

3 x 7 = 21

3 x 6 = 18

3 x 4 = 12

3 x 1 = 3

3 x 9 = 27

3 x 10 = 30

3 x 8 = 24

3 x 2 = 6

2 x 3 = 6

3 x 5 = 15

5 x 3 = 15