Compare 15/30 and 20/42
15/30 is greater than 20/42
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 42 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
15/30 = 15 × 7/30 × 7 = 105/210 - Likewise, for the 2nd fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 105/210 > 100/210 or 15/30 > 20/42
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