First off, you have to find the perfect square root by multiplying the same two numbers.

For Example: 25 has a square root of 5, and 36 has a square root of 6. We need to find the square root of 32. Then we go in between 25 and 36. Therefore we can eliminate 5.1, 5.2, 5.3, 5.4. I believe the answer would be 5.65 , because its the in the middle of the two numbers.