Compare 21/80 and 7/81
21/80 is greater than 7/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 81 is 6480
Next, find the equivalent fraction of both fractional numbers with denominator 6480 - For the 1st fraction, since 80 × 81 = 6480,
21/80 = 21 × 81/80 × 81 = 1701/6480 - Likewise, for the 2nd fraction, since 81 × 80 = 6480,
7/81 = 7 × 80/81 × 80 = 560/6480 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 1701/6480 > 560/6480 or 21/80 > 7/81
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