Presentation on theme: "Inverse You will learn: That addition is the inverse of subtraction."— Presentation transcript:
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=89+7=1623+41=6439+22=618-2=616-7=964-41=2361-22=39Can you make a different subtraction?
3 You can use this method to check your answers. 9+4=13Check your answer by turning it into a subtraction:13-4=913-9=4or
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=1515-7=8It 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=1616+9=25It 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.