Which of the following number (s) is a perfect square (s) ? Select all that apply.

25

2

81

1

5

11

144

45

400

36

225

4

9

To find if they are perfect squares, find the square root of each number, if it is a whole number (no decimal) it is a perfect square, if it contains a decimal it is not.

25 : √25 = 5 YES

2 : √2 = 1.414 NO

81 : √81 = 9 YES

1 : √1 = 1 YES

5 : √5 = 2.23 NO

11 : √11 = 3.31 NO

144 : √144 = 12 YES

45 : √45 = 6.70 NO

400 : √400 = 20 YES

36 : √36 = 6 YES

225 : √225 = 15 YES

4 : √4 = 2 YES

9: √9 = 3 YES