Maths

So can we find an easy way to add numbers that end in 9.

Can we come up with a rule?

Mummy addition

What could we do to make adding numbers ending in 8 or 7?

1 Comment

  1. Mr L

    November 22, 2017 at 11:43 am

    To add numbers that end in 9
    First we add 1 to make the ones column = 0
    Then we do the calculation to find the answer.
    But we need to take away 1 to get the correct answer.

    For example
    164 + 59
    add 1 to 59 to make 60
    then do 164 + 60 = 224
    finally take away 1 from 224 to get correct answer which is 223

    Ayan, Milana, Rayaan, Mohammed and Alamin

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