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Published byEthan Stokes Modified over 2 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.

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Can you turn these addition number sentences into subtractions? 6+2=8 9+7= = =61 8-2=6 16-7= = =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 or 13-9=4

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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! +7=15 It is an addition, so start at the end and turn it into a subtraction… 15-7=88

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

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

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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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