# Inverse You will learn: That addition is the inverse of subtraction.

## Presentation on theme: "Inverse You will learn: That addition is the inverse of subtraction."— Presentation transcript:

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

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?

9+4= 13 Check your answer by turning it into a subtraction: 13-4= 9 13-9= 4 or

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

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…

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…

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

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.

Similar presentations