Presentation on theme: "Inverse You will learn: That addition is the inverse of subtraction."— Presentation transcript:
1Inverse 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
2Can 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?
3You can use this method to check your answers. 9+4=13Check your answer by turning it into a subtraction:13-4=913-9=4or
4What would you do if an equation had a missing number? +7=15
5It 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…
6It 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…
7In 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
8Plenary 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.