Year 7 Interactive Maths - Second Edition

Square Roots

For example, to find the square root of 4, we have to think of a number that when multiplied by itself gives 4.  The number is 2 since 2 × 2 = 4.

So the square root of a given number is the positive number whose square produces the given number. 

Example 8

What number do you have to square to get each of the following numbers?
a.  144
b.  400

Solution:

Example 9

Solution:

Key Terms

square root, square root symbol