Compare 18/21 and 49/72
18/21 is greater than 49/72
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 72 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 21 × 24 = 504,
18/21 = 18 × 24/21 × 24 = 432/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
49/72 = 49 × 7/72 × 7 = 343/504 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 432/504 > 343/504 or 18/21 > 49/72
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 49/72 18/21 and 98/72 18/42 and 49/72 54/21 and 49/72 18/63 and 49/72 90/21 and 49/72