Compare 20/30 and 21/81
20/30 is greater than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 30 × 27 = 810,
20/30 = 20 × 27/30 × 27 = 540/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
21/81 = 21 × 10/81 × 10 = 210/810 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 540/810 > 210/810 or 20/30 > 21/81
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