Compare 81/21 and 18/36
1st number: 3 18/21, 2nd number: 18/36
81/21 is greater than 18/36
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
81/21 = 81 × 12/21 × 12 = 972/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
18/36 = 18 × 7/36 × 7 = 126/252 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 972/252 > 126/252 or 81/21 > 18/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42 and 18/36 81/21 and 18/72 81/21 and 54/36 81/63 and 18/36 81/21 and 90/36