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Using the Difference of Two Squares

In this worksheet, students practise using the difference of two squares.

'Using the Difference of Two Squares' worksheet

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Understand Integer Powers/Real Roots

Difficulty level:  

Worksheet Overview

This worksheet is about working out the difference of two squares numbers.

We use the fact that a2 - b2 factorises to (a + b) (a - b)


Using this fact, we can work out:

152 - 82 = (15+8)×(15-8) = 23×7 = 161

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