Compare 21/15 and 30/80, Which fraction is greater?

Compare 21/15 and 30/80

1^st number: 1 6/15, 2^nd number: 30/80

21/15 is greater than 30/80

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 80 is 240

Next, find the equivalent fraction of both fractional numbers with denominator 240
For the 1st fraction, since 15 × 16 = 240,
21/15 = 21 × 16/15 × 16 = 336/240
Likewise, for the 2nd fraction, since 80 × 3 = 240,
30/80 = 30 × 3/80 × 3 = 90/240
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
336/240 > 90/240 or 21/15 > 30/80

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