Compare 18/49 and 21/81
18/49 is greater than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 81 is 3969
Next, find the equivalent fraction of both fractional numbers with denominator 3969 - For the 1st fraction, since 49 × 81 = 3969,
18/49 = 18 × 81/49 × 81 = 1458/3969 - Likewise, for the 2nd fraction, since 81 × 49 = 3969,
21/81 = 21 × 49/81 × 49 = 1029/3969 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 1458/3969 > 1029/3969 or 18/49 > 21/81
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