How many square numbers are there less than 100?

There are 11 square numbers between 0 an 100

0^2 = 0

1^2 = 1

2^2 = 4

3^2 = 9

4^2 = 16

5^2 = 25

6^2 = 36

7^2 = 49

8^2 = 64

9^2 = 81

10^2 = 100