This lesson is about taking the square root - the opposite of squaring numbers.

You square a number when you multiply the number by itself.

To square 5, multiply 5 x 5 = 25, or 52=25.

If you form a square with 3 tiles on each side, you will use 9 tiles. This shows that 32=9.

 

     
     
     

 

The area of the square is 3 x 3, or 32, or 3 squared.

The opposite, or inverse, of squaring a number is taking the square root.

The symbol is used to indicate nonnegative square roots.

Example:

1. What is 62? 36

2. What is ? 9

3. Try this out. What other number, besides 9, can you square to get 81? -9 (because -9 x -9 = 81 or -92=81.)

 

SQUARE ROOT CALCULATOR

Number: Square Root:

 

Copyright © June 2002 by Analyn A. Alquitran