Compare 15/21 and 56/18
1st number: 15/21, 2nd number: 3 2/18
15/21 is smaller than 56/18
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
15/21 = 15 × 6/21 × 6 = 90/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
56/18 = 56 × 7/18 × 7 = 392/126 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 90/126 < 392/126 or 15/21 < 56/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21 and 56/18 15/42 and 56/18 15/21 and 56/36 45/21 and 56/18 15/63 and 56/18 15/21 and 56/54 75/21 and 56/18 15/21 and 56/90