1. Inverse You will learn: That addition is the inverse of subtraction.
To check your answers by using the inverse operation.
To solve simple ‘missing number’ problems by using the inverse method. 1

2. Can you turn these addition number sentences into subtractions?
6+2=8
9+7=16
23+41=64
39+22=61
8-2=6
16-7=9
64-41=23
61-22=39
Can you make a different subtraction?

3. You can use this method to check your answers.
9+4= 13
Check your answer by turning it into a subtraction:
13-4= 9
13-9= 4 or

4. What would you do if an equation had a missing number?
+7=15

5. It is not a straight forward task, so use the numbers you have been given!8
+7=15
15-7= 8
It is an addition, so start at the end and turn it into a subtraction…

6. It is not a straight forward task, so use the numbers you have been given!25
-9=16
16+9= 25
It is a subtraction, so start at the end and turn it into an addition…

7. In your books, try to solve these problems
In your books, try to solve these problems. Record the inverse calculation.
-8=14
+13=29
-19=13
+20=41
-27=56
+17=31
-30=65
+14=35

8. Plenary Addition and subtraction are the inverse of each other.
Use this fact to help you check your answers when performing addition and subtraction calculations.
If the first number of a problem is missing, try using the inverse method.