When you have a fraction like (19/20) and multiply it by its denominator (19). The answer is the denominator subtracted from the numerator (usually a negative number) added to the numerator. The numerator of the remainder is difference between the two squared and the denominator is the denominator from the original fraction.
E.x.
(19/20) * 19 = 18(1/20)
19-20 = -1 + 19 = 18
then 19-20=-1, -1^2 = 1, over 20.
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