If you have not yet tried Squares and Cubes do this first.

A square root is the opposite of squaring a number. The symbol for square root is √.

So if 3²=9 then √9=3

A cube root is the opposite of cubing a number. The symbol for cube root is ³ √.

So if 3³=27 then ³ √27=3

TrySquares, Square Roots, Cubes and Cube Roots to help you become familiar with the important examples of this.