Home learning focus
Today, find out about number facts and the connection between addition and subtraction
This lesson includes:
three interactive activities
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
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?
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
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 the Addition and Subtraction levels of Karate Cats Maths to test your skills on fact families and more!
There's more to learn
Have a look at these other resources around the BBC and the web.