• @bstix@feddit.dk
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    31 year ago

    Multiplication of x times 6:

    x * 6 = 1/2 x * 10 + x

    This can sometimes be a shortcut for numbers that are easier to divide by 2 than to multiply by 6.

    Take half as tens and add the number.

    6 * 6 = 30 + 6 = 36

    8 * 6 = 40 + 8 = 48

    150 * 6 = 750 + 150 = 900

    320 = 1600 + 320 = 1920

    Etc.

    Sleep well.