Know Subtracting Bonds Up to 20

In this activity, we need to know the subtracting number bonds up to 20.

We should know these off by heart.

The stars will remind you of the subtracting number bonds to 10:

Can you see that the subtraction facts are the same as the addition facts but just the other way around?

For example, 10 - 1 = 9 would be 9 + 1 = 10. The numbers just get moved around, so if you know your adding number bonds, you will know your subtraction bonds! 

Now, let's look at the number bond subtraction facts to 20. 

20 - 0 = 20

20 - 1 = 19

20 - 2 = 18

20 - 3 = 17 

20 - 4 = 16

20 - 5 = 15

20 - 6 = 14

20 - 7 = 13

20 - 8 = 12

20 - 9 = 11

20 - 10 = 10

Can you follow the pattern to complete all the subtraction number bonds to 20?

Example

20 - _ = 5

If you know the missing number in this subtraction number bond off by heart, then brilliant, just write in the answer. 

If you are not sure, move it around into an addition number bond:

5 + _  = 20 

What would go with 5 to make 20? It's 15. Remember, if you know your addition number bonds, you will know your subtraction number bonds! 

Are you ready to have a go?