Compare 21/63 and 48/80, Which fraction is greater?

Compare 21/63 and 48/80

21/63 is smaller than 48/80

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 80 is 5040

Next, find the equivalent fraction of both fractional numbers with denominator 5040
For the 1st fraction, since 63 × 80 = 5040,
21/63 = 21 × 80/63 × 80 = 1680/5040
Likewise, for the 2nd fraction, since 80 × 63 = 5040,
48/80 = 48 × 63/80 × 63 = 3024/5040
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
1680/5040 < 3024/5040 or 21/63 < 48/80

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