Compare 18/27 and 21/81
18/27 is greater than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 27 × 3 = 81,
18/27 = 18 × 3/27 × 3 = 54/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
21/81 = 21 × 1/81 × 1 = 21/81 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 54/81 > 21/81 or 18/27 > 21/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/27 and 21/81 18/27 and 42/81 18/54 and 21/81 54/27 and 21/81 18/27 and 63/81 18/81 and 21/81 90/27 and 21/81