Question

1. If the units digit of a number is 0, then tens digit of square of that number is

a) 1 b) 0 c) 2 d) 3​

Answer 1

If unit digit is 0 then tens digit of square will also be 0

Example:
1) 10
= (10)^2
= 100

2)30
= (30)^2
= 900