The square root of a number is the number that, when multiplied by itself, gives the original number.

For example:

The square root of 9 is 3, because 3 x 3 = 9 The square root of 16 is 4, because 4 x 4 = 16 We usually write the square root symbol like this: √. So, √9 means the square root of 9.

It's important to remember that there are two answers to some square root problems. For example, both -3 and 3 are square roots of 9, because (-3) x (-3) = 9, and 3 x 3 = 9.