Compare 21/15 and 28/64, Which fraction is greater?

Compare 21/15 and 28/64

1^st number: 1 6/15, 2^nd number: 28/64

21/15 is greater than 28/64

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 64 is 960

Next, find the equivalent fraction of both fractional numbers with denominator 960
For the 1st fraction, since 15 × 64 = 960,
21/15 = 21 × 64/15 × 64 = 1344/960
Likewise, for the 2nd fraction, since 64 × 15 = 960,
28/64 = 28 × 15/64 × 15 = 420/960
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
1344/960 > 420/960 or 21/15 > 28/64

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