Compare 81/9 and 81/21
1st number: 9 0/9, 2nd number: 3 18/21
81/9 is greater than 81/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
81/9 = 81 × 7/9 × 7 = 567/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
81/21 = 81 × 3/21 × 3 = 243/63 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 567/63 > 243/63 or 81/9 > 81/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18 and 81/21 81/9 and 81/42 81/27 and 81/21 81/9 and 81/63 81/45 and 81/21 81/63 and 81/21