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28 March, 21:18

Give one example of when would use the friendly numbers strategy to substract. Explain why

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  1. 28 March, 22:11
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    Here is one example of when you would use the friendly number strategy to subtract.

    42 - 18

    We will turn the 18 into a friendly number, which is going to be 20.

    (42 + 2) - (18 + 3)

    44 - 20

    Now it is easier to subtract 44 - 20 than it is 42 - 18. With 42 - 18 we would have to barrow whereas with 44 - 20 we do not have to barrow and we can do it in our head easier and makes it faster.
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