Compare 15/20 and 21/27
15/20 is smaller than 21/27
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 27 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 20 × 27 = 540,
15/20 = 15 × 27/20 × 27 = 405/540 - Likewise, for the 2nd fraction, since 27 × 20 = 540,
21/27 = 21 × 20/27 × 20 = 420/540 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 405/540 < 420/540 or 15/20 < 21/27
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