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17 October, 13:28

How can you express 499 to find the product 499X5 using mental math? Explain.

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  1. 17 October, 14:54
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    2 ways

    anything times 5 can be found by halving the number and multiplying by 10

    so we get 249.5 times 10 or 2495

    or, we can do

    499=500-1

    so

    499 times 5 = (500-1) (5) = 5 (500-1) = 5 (500) + 5 (-1) = 2500-5=2495
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