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28 May, 00:15

Use distributive property and mental math to find the product

7x49

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  1. 28 May, 00:23
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    We remember that the distributive propert is a (b+c) = ab+ac

    2 ways we can do this is to write 49 as either 40+9 or 50-1

    if we do 40+9

    7 (49) = 7 (40+9) = 7 (40) + 7 (9) = 280+63=343

    if we do 50-1

    7 (49) = 7 (50-1) = 7 (50) + 7 (-1) = 350-7=343
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