Compare 5/21 and 21/81
5/21 is smaller than 21/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
5/21 = 5 × 27/21 × 27 = 135/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
21/81 = 21 × 7/81 × 7 = 147/567 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 135/567 < 147/567 or 5/21 < 21/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21 and 21/81 5/21 and 42/81 5/42 and 21/81 15/21 and 21/81 5/21 and 63/81 5/63 and 21/81 25/21 and 21/81 35/21 and 21/81