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Published byEthan Stokes Modified over 4 years ago

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**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

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**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?

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**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

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**What would you do if an equation had a missing number?**

+7=15

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**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…

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**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…

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**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

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**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.

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