Compare 21/72 and 18/28
21/72 is smaller than 18/28
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 28 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 72 × 7 = 504,
21/72 = 21 × 7/72 × 7 = 147/504 - Likewise, for the 2nd fraction, since 28 × 18 = 504,
18/28 = 18 × 18/28 × 18 = 324/504 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 147/504 < 324/504 or 21/72 < 18/28
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