8/20-15/20=7/20
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You can subtract the bigger fraction by the smaller fraction and then put a minus sign in front of the answer.
smaller
No, because there is an infinite number of possibilities smaller from the larger gives
If the fractions have the same numerator (top number), then the fraction with the larger denominator (bottom number) is the smaller fraction, which implies that the fraction with the smaller denominator is the larger fraction. For example with 1/2 and 1/4, it can be easily seen that 1/2 is the larger of the two.
it is smaller (1/2)/2=.25