IXL | Square roots of perfect squares

What is the square root of 4?

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Learn with an example

question

What is

121

14,641

242

key idea

To find the square root (

) of a given number, figure out which number squared (multiplied by itself) equals that given number.

solution

You want to find

121

, so figure out which number squared (multiplied by itself) equals 121.

The number 11 squared equals 121:

112 = 11 × 11 = 121

So the square root of 121 is 11.

You can also get the same answer by thinking of "squared" and "square root" as opposites.

For example, you can square 11 to get 121:

112 = 121

Now do the opposite. Take the square root of 121 to get 11:

121 = 11

Either method shows that

121

is 11.

Looking for more? Try this:

Lesson: Square roots

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Lesson: Square roots

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