Question

Which of the following number(s) is a perfect square(s)? Select all that apply. 1 2 4 5 9 11 25 36 45 81 144 225 400

Answer 1

a perfect square is what u get when u multiply 2 of the same numbers together.

For example : 2 * 2 = 4.....4 is a perfect square
3 * 3 = 9...9 is a perfect square
4 * 4 = 16....16 is a perfect square
2 cannot be a perfect square because u cant multiply anything by itself that equals 2.

so ur perfect square numbers are : 1,4,9,25,36,81,144,225,400

Answer 2

1 , 4 , 9 , 25 , 36 , 81, 144, 225, 400 are perfect square.

Explanation:

1 = 1 × 1 = ( 1 )² ; Perfect Square

2 ; Not a Perfect Square

5 ; Not a Perfect Square

9 = 3 × 3 = (3)² ; Perfect Square

11 ; Not a Perfect Square

25 = 5 × 5 = (5)² ; Perfect Square

36 = 6 × 6 = (6)² ; Perfect Square

45 = 9 × 5 ; Not a Perfect Square

81 = 9 × 9 = (9)² ; Perfect Square

144 = 12 × 12 = (12)² ; Perfect Square

225 = 15 × 15 = (15)² ; Perfect Square

400 = 20 × 20 = (20)² ; Perfect Square

Thus, 1 , 4 , 9 , 25 , 36 , 81, 144, 225, 400 are perfect squares.