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26 October, 03:05

Writing to Explain Use rounding to estimate the product 12*9. Then, use compensation to find the total cost for 12 books that were $9 each, would she get a good estimate? Explain

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  1. 26 October, 03:17
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    So if we do not know what 12 times 9 is then we can round 9 to 10 and get

    12 times 10

    most people can multiply by ten so this should be easy so

    12 times 10=120

    12 times 9=108

    she was off by 12 so a 10% deviation error

    another way to do it is you multiply 12 by 10 and get 10 12's

    then you subtract 1 12 and get 9 12's
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