  # Adding and Subtracting Family Groups (1)

In this worksheet, students must know that addition and subtraction are inverses and each fact has three other related facts. Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Understand Relationship Between Addition and Subtraction

Difficulty level:   #### Worksheet Overview

Addition and subtraction family facts normally come in FOURS

There are TWO addition facts and TWO subtraction facts.

If we know just one of them, we can always work out the other three.

If we know the addition fact that

3 + 5 = 8

we can say that the other addition fact in this family is

5 + 3 = 8

The subtraction facts in this family will be

8 - 5 = 3

and

8 - 3 = 5

Example

What are the three related family facts for...?

15 + 18 = 33

For the other addition fact, just reverse the first two numbers.

The other addition fact in this family is

18 + 15 = 33

The subtraction facts in this family will be

33 - 15 = 18

and

33 - 18 = 15

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