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7 December, 06:35

Show work when multiplying 3.9*5.3

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  1. 7 December, 08:50
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    I use the expansion distributive thing

    remember a (b+c) = ab+ac

    3.9=4-0.1

    3.9 times 5.3=

    (4-0.1) times 5.3=

    5.3 (4-0.1) =

    5.3 (4) + 5.3 (-0.1) =

    (5+0.3) 4+5.3 (-0.1) =

    20+1.2-0.52=

    20+0.68=

    20.68

    taht's one way
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