# Relate Subtraction and Addition Facts

In this worksheet, students will look at a subtraction fact and write down three more facts based on it.

Key stage:  KS 2

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Solve Add/Subtract Problems to 1000

Difficulty level:

#### Worksheet Overview

From any subtraction fact, we can normally get another subtraction fact and also two addition facts.

Look at the subtraction fact:

8 - 3 = 5

From this, we can also say that:

8 - 5 = 3

And we can also write these two addition facts:

3 + 5 = 8

5 + 3 = 8

This will work for any numbers, even much larger ones.

Example

Use the subtraction fact:

63 - 27 = 36

to work out the values of A, B, C and D.

63 - 36 = A

36 + B = 63

27 + C = D

From the subtraction fact:

63 - 27 = 36

We get the other subtraction fact:

63 - 36 = 27

and the two addition facts:

36 + 27 = 63

27 + 36 = 63

So

A = 27

B = 27

C = 36

D = 63

Does that make sense?

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