# What is the square root of 625 simplified in radical form?

##### 2 Answers

25

#### Explanation:

Also, let's not forget that -25 works too!

If no calculator to hand it is always worth trying this type of trick

#### Explanation:

Consider the last digit of 625

This is 5. So the first question is, what times itself give the last digit of 5.

Known that

Consider the hundreds ie 600

Putting this together lets test

However:

So

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If all else fails and you do not have a calculator to hand build a prime factor tree.

From this observe that we have

So