Question

Tính nhẩm

9 x 1 = .....	9 x 2 = .....	9 x 3 = .....	9 x 4 = .....
1 x 9 = .....	2 x 9 = .....	3 x 9 = .....	4 x 9 = .....
9 x 5 = .....	9 x 6 = .....	9 x 7 = .....	9 x 8 = .....
5 x 9 = .....	6 x 9 = .....	7 x 9 = .....	8 x 9 = .....

Answer 1

9 x 1 = 9	9 x 2 = 18	9 x 3 = 27	9 x 4 = 36
1 x 9 = 9	2 x 9 = 18	3 x 9 = 27	4 x 9 = 36
9 x 5 = 45	9 x 6 = 54	9 x 7 = 63	9 x 8 = 72
5 x 9 = 45	6 x 9 = 54	7 x 9 = 63	8 x 9 =72