Compare 18/20 and 15/81
18/20 is greater than 15/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
18/20 = 18 × 81/20 × 81 = 1458/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
15/81 = 15 × 20/81 × 20 = 300/1620 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 1458/1620 > 300/1620 or 18/20 > 15/81
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