Compare 81/21 and 9/7
1st number: 3 18/21, 2nd number: 1 2/7
81/21 is greater than 9/7
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
81/21 = 81 × 1/21 × 1 = 81/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
9/7 = 9 × 3/7 × 3 = 27/21 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 81/21 > 27/21 or 81/21 > 9/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/21 and 18/7 81/42 and 9/7 81/21 and 9/14 81/21 and 27/7 81/63 and 9/7 81/21 and 9/21 81/21 and 45/7 81/21 and 9/35 81/21 and 63/7 81/21 and 9/49