Compare 21/27 and 72/84
21/27 is smaller than 72/84
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 84 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 27 × 28 = 756,
21/27 = 21 × 28/27 × 28 = 588/756 - Likewise, for the 2nd fraction, since 84 × 9 = 756,
72/84 = 72 × 9/84 × 9 = 648/756 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 588/756 < 648/756 or 21/27 < 72/84
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