Compare 63/21 and 80/72
1st number: 3 0/21, 2nd number: 1 8/72
63/21 is greater than 80/72
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,
63/21 = 63 × 24/21 × 24 = 1512/504 - Likewise, for the 2nd fraction, since 72 × 7 = 504,
80/72 = 80 × 7/72 × 7 = 560/504 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 1512/504 > 560/504 or 63/21 > 80/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42 and 80/72