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5 September, 08:23

Using compatible numbers to estimate 83+34

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  1. 5 September, 10:06
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    80 + 30

    then add

    80 + 30=110

    then add the numbers you left out

    3 + 4 = 7

    and you get 117

    or you can round up

    90 + 40

    90 + 40=130

    then you subtract the numbers you added on

    90 - 83 = 7

    40 - 34 = 6

    then you add those and subtract from 130 and you get 11Answer here
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