Compare 15/21 and 20/25
15/21 is smaller than 20/25
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
15/21 = 15 × 25/21 × 25 = 375/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
20/25 = 20 × 21/25 × 21 = 420/525 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 375/525 < 420/525 or 15/21 < 20/25
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