Compare 25/21 and 90/64, Which fraction is greater?

Compare 25/21 and 90/64

1^st number: 1 4/21, 2^nd number: 1 26/64

25/21 is smaller than 90/64

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 64 is 1344

Next, find the equivalent fraction of both fractional numbers with denominator 1344
For the 1st fraction, since 21 × 64 = 1344,
25/21 = 25 × 64/21 × 64 = 1600/1344
Likewise, for the 2nd fraction, since 64 × 21 = 1344,
90/64 = 90 × 21/64 × 21 = 1890/1344
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
1600/1344 < 1890/1344 or 25/21 < 90/64

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