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21 September, 16:08

Find 93 • 87 using mental math.

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  1. 21 September, 16:33
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    Okay so start with multiplying 93 * 7

    So 3 x 7 = 21

    9 X 7 + 63, carry the 2 = 651

    Then 8 x 93

    Remember that first is a zero.

    8 X 3 = 24

    8 X 9 = 72, carry the 2 = 74

    So that is 7440

    Now

    0651

    +7440

    8091

    And that's the answer
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