Compare 3/15 and 21/90
3/15 is smaller than 21/90
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 15 × 6 = 90,
3/15 = 3 × 6/15 × 6 = 18/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 18/90 < 21/90 or 3/15 < 21/90
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