Question

[Pham Trong Bach]

Tính nhẩm:

20 x 4 = .......	200 x 3 = .......	2000 x 2 = .......
30 x 4 = .......	300 x 3 = .......	3000 x 2 = .......
40 x 4 = .......	400 x 3 = .......	4000 x 2 = .......

Answer 1

[Cao Minh Tâm]

20 x 4 = 80	200 x 3 = 600	2000 x 2 = 4000
30 x 4 = 120	300 x 3 = 900	3000 x 2 = 6000
40 x 4 = 160	400 x 3 = 1200	4000 x 2 = 8000