Learn how to find the square root of perfect squares like 25, 36, and 81.
Let's start by taking a look at an example evaluating the square root of 25\greenD{25}:
25=?\large \sqrt{\greenD{25}} = \,?
Step 1: Ask, "What number squared equals 25\greenD{25}?"
Step 2: Notice that 5\blueD5 squared equals 25\greenD{25}.
52=5×5=25\large \blueD5^2= \blueD5 \times \blueD5 = \greenD{25}
The answer
25=5\large \sqrt{\greenD{25}} = \blueD5
Here's a question to make sure you understood:

Connection to a square

Finding the square root of 25\greenD{25} is the same as finding the side length of a square with an area of 25\greenD{25}.
A square with an area of 25\greenD{25} has a side length of 5\blueD{5}.

Practice Set 1:

Reflection question

Practice Set 2:

Practice Set 3: