Compare 4/21 and 15/42
4/21 is smaller than 15/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
4/21 = 4 × 2/21 × 2 = 8/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
15/42 = 15 × 1/42 × 1 = 15/42 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 8/42 < 15/42 or 4/21 < 15/42
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