Compare 21/54 and 15/81
21/54 is greater than 15/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 54 × 3 = 162,
21/54 = 21 × 3/54 × 3 = 63/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
15/81 = 15 × 2/81 × 2 = 30/162 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 63/162 > 30/162 or 21/54 > 15/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54 and 15/81 21/54 and 30/81 63/54 and 15/81 21/54 and 45/81 21/54 and 75/81