Multiplication puzzle

Multiple by 8 without using multiplication or addition Now do the same with 7?

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SherlockHolmes Expert Asked on 28th November 2015 in Interview Puzzles.
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  • 1 Answer(s)

    We can use SUBTRACTION and DIVISION

    Let n be the number multiplying by

    For 8 –
    (n-n)-n-n-n-n-n-n-n-n / -1

    Example: let n = 4
    (4-4)-4-4-4-4-4-4-4 = -32 / -1 = 32
    We know,
    8*4 = 32

    For 7 –
    (n-n)-n-n-n-n-n-n-n / -1

    Example: let n = 3
    (3-3)-3-3-3-3-3-3-3 = -21 / -1 = 21
    and we know,
    7*3 = 21

    Detective Expert Answered on 30th November 2015.
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