Compare 8/81 and 21/30
8/81 is smaller than 21/30
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 30 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
8/81 = 8 × 10/81 × 10 = 80/810 - Likewise, for the 2nd fraction, since 30 × 27 = 810,
21/30 = 21 × 27/30 × 27 = 567/810 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 80/810 < 567/810 or 8/81 < 21/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/81 and 21/30 8/81 and 42/30 8/81 and 21/60 24/81 and 21/30 8/81 and 63/30 8/81 and 21/90 40/81 and 21/30 56/81 and 21/30