Which of the following numbers are perfect squares? 27 36 81 108 121

36, 81, and 121.

explanation: find out which numbers are perfect squares.

well, we know from our basic multiplication tables that: 6x6 = 36, 9 x 9 = 81 and 11 x 11 = 121.

what about 27 and 108?

we can rule out these numbers by finding square roots both bigger and smaller.

we know that 5 x5 = 25, so the square root of 25 is 5
we know that 6 x 6 = 36, so the square root of 36 is 6.

Perfect squares are whole numbers, and the square root of 27 is in between 2 other perfect squares, meaning it cannot be a perfect square.

we know that 10 x 10 = 100, so the square root of 100 is 10
we know that 11 x 11 = 121, so the square root of 121 is 11

Perfect squares are whole numbers, and the square root of 121 is in between 2 otehr perfect squares, meaning it cannot be a perfect square.

so, the only ones we can do are 36, 81, and 121. Hope this helps!

4.(answer) 7. 20
6.(answer) 10.80
8.(answer) 14.50