3-By-1 Mental Math Multiplication

Discussion in 'Calculator Requests' started by math_celebrity, Jan 5, 2024.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    987
    x 9
    ------

    Break apart 987:
    900 + 80 + 7

    So we have:
    900 * 9 = 8100
    80 * 9 = 720
    7 * 9 = 63

    Add them up and we get 8,883

     

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