Question

What is 10x10,20x90,30x30,and 40x40

Answer 1

100

1800

900

1600

Explanation:

Easy way to solve :

remove the 0's eg

20*90 -> 2*9 = 18

then add the 0's back on

1800

Answer 2

See below ↓↓↓↓

Explanation:

1. 10 x 10 = 100
2. 20 x 90 = 1800
3. 30 x 30 = 900
4. 40 x 40 = 1600