Compare 18/21 and 21/36
18/21 is greater than 21/36
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,
18/21 = 18 × 12/21 × 12 = 216/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
21/36 = 21 × 7/36 × 7 = 147/252 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 216/252 > 147/252 or 18/21 > 21/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21 and 21/36 18/21 and 42/36 18/42 and 21/36 18/21 and 21/72 54/21 and 21/36 18/21 and 63/36 18/63 and 21/36 90/21 and 21/36