  # Addition and Subtraction of Square Numbers

In this worksheet, students add together square numbers. They should try the calculations mentally first. Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Understand Integer Powers/Real Roots

Difficulty level:   #### Worksheet Overview

For this worksheet, it will be useful for you to know the square numbers off by heart.

12 = 1

22 = 4

32 = 9

42 = 16

52 = 25

62 = 36

72 = 49

82 = 64

92 = 81

102 = 100

112 = 121

122 = 144

It's also useful to know that 152 = 225

Example

Work out the following mentally.

52 + 10 =
 25 + 10 = 35

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