Compare 81/21 and 9/12
1st number: 3 18/21, 2nd number: 9/12
81/21 is greater than 9/12
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
81/21 = 81 × 4/21 × 4 = 324/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
9/12 = 9 × 7/12 × 7 = 63/84 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 324/84 > 63/84 or 81/21 > 9/12
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 18/12 81/42 and 9/12 81/21 and 9/24 81/21 and 27/12 81/63 and 9/12 81/21 and 9/36 81/21 and 45/12 81/21 and 9/60 81/21 and 63/12 81/21 and 9/84