Compare 21/15 and 3/81
1st number: 1 6/15, 2nd number: 3/81
21/15 is greater than 3/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
21/15 = 21 × 27/15 × 27 = 567/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
3/81 = 3 × 5/81 × 5 = 15/405 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 567/405 > 15/405 or 21/15 > 3/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15 and 3/81 21/15 and 6/81 21/30 and 3/81 63/15 and 3/81 21/15 and 9/81 21/45 and 3/81 21/15 and 15/81 21/75 and 3/81 21/15 and 21/81