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2 May, 05:00

Explain how to find 40 multiply by 50 using mental math.

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  1. 2 May, 08:59
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    Take 4 and multiply it by 5 (which you should be able to do in your head) and then add the two zeros back in so:

    4•5 = 20

    20+0+0=

    2000
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