  # Addition and Subtraction Facts to 100 (2)

In this worksheet, students must know by heart their addition and subtraction number bonds to 20 and use them to derive related facts to 100. Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Addition/Subtraction Facts to 100

Difficulty level:   #### Worksheet Overview

Look at this number square, which shows all the bonds you should know by heart up to 20. You can use this table to work out additions and subtractions right up to 100.

Example 1

We split 76 into 70 and 6.

We now need to work out

70 + 6 + 9

You should know this by heart, but the number square shows that

6 + 9 = 15 So

76 + 9   = 70 + 6 + 9

= 70 + 15 = 85

Example 2

Subtract  85 - 9

We split 85 into 70 and 15.

We now need to work out

70 + 15 - 9

You should know this by heart, but the number square shows that

15 - 9 = 6

When you subtract, the starting number is inside the square. So

85 - 9  = 70 + 15 - 9

= 70 + 6  = 76

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