Fact families - addition facts

Learning focus

Find out about number facts and the connection between addition and subtraction.

This lesson includes:

  • a quiz
  • two videos
  • one interactive activity

Quiz

To get started, let's see how well you know this topic already. Take the catch-up quiz below to find out.

Learn

When you add two numbers together, which way around should they go? Watch this video from 1st Level Maths and Numeracy to find out.

Fin and Snoot add up some of their favourite snacks: space grubs and astro bugs.

Addition

It doesn't matter which way round you add numbers. The answer is always the same.

1 + 2 will always be the same as 2 + 1

Top tip

You might find it easier to start with the bigger number and add the smaller one.

7 + 2 might be easier if you turn it round to 2 + 7.

2 + 7 = 9

7 + 2 = 9

Try it yourself. What works for you?

Subtraction

We know that 2 + 7 = 9. With this information we can move the numbers around again to make more number facts.

7 - 2 = 5

9 - 7 = 2

While juggling, Fin and Snoot learn that subtraction is the opposite of addition.

Fact families

A fact family is a group of calculations that are created using the same three numbers. For example, here is a fact family that uses the numbers 2 , 4 and 6.

2 + 4 = 6

4 + 2 = 6

6 - 2 = 4

6 - 4 = 2

Play

Play the Addition and Subtraction levels of Karate Cats Maths to test your skills on fact families and more!

Game - Karate Cats Maths

There's more to learn

Have a look at these other resources.

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