Compare 8/72 and 18/21, Which fraction is greater?

Compare 8/72 and 18/21

8/72 is smaller than 18/21

Find the least common denominator or LCM of the two denominators:
LCM of 72 and 21 is 504

Next, find the equivalent fraction of both fractional numbers with denominator 504
For the 1st fraction, since 72 × 7 = 504,
8/72 = 8 × 7/72 × 7 = 56/504
Likewise, for the 2nd fraction, since 21 × 24 = 504,
18/21 = 18 × 24/21 × 24 = 432/504
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
56/504 < 432/504 or 8/72 < 18/21

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