Compare 21/8 and 4/81
1st number: 2 5/8, 2nd number: 4/81
21/8 is greater than 4/81
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 8 × 81 = 648,
21/8 = 21 × 81/8 × 81 = 1701/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
4/81 = 4 × 8/81 × 8 = 32/648 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 1701/648 > 32/648 or 21/8 > 4/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8 and 4/81 21/8 and 8/81 21/16 and 4/81 63/8 and 4/81 21/8 and 12/81 21/24 and 4/81 21/8 and 20/81 21/40 and 4/81 21/8 and 28/81 21/56 and 4/81