Compare 21/56 and 15/20
21/56 is smaller than 15/20
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 20 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Likewise, for the 2nd fraction, since 20 × 14 = 280,
15/20 = 15 × 14/20 × 14 = 210/280 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 105/280 < 210/280 or 21/56 < 15/20
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