Fact families

Home learning focus

Today, find out about number facts and the connection between addition and subtraction

This lesson includes:

  • two videos

  • three interactive activities

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.

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

10 + 2 will always be the same as 2 + 10

Top tip

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

8 + 13 might be easier if you turn it round to 13 + 8.

13 + 8 = 21

8 + 13 = 21

Try it yourself. What works for you?

Subtraction

We know that 13 + 8 = 21. With this information we can move the numbers around again to make more number facts.

21 - 13 = 8

21 - 8 = 13

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

Practise

Activity 1

Worksheet: Fact families

Have a go at this worksheet from Pearson. You can print it out or write your answers on a sheet of paper.

Think together - Fact families

Activity 2

Worksheet: Related facts

Have a go at this worksheet from Twinkl about using fact families. You can print it out or write your answers on a sheet of paper.

Fact families

Activity 3

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 around the BBC and the web.

KS1 Maths
BBC Bitesize Daily
Primary games
5 - 7 Maths
Play Go Jetters Hero Academy
Make a rainbow