Compare 20/18 and 15/21
1st number: 1 2/18, 2nd number: 15/21
20/18 is greater than 15/21
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
20/18 = 20 × 7/18 × 7 = 140/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
15/21 = 15 × 6/21 × 6 = 90/126 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 140/126 > 90/126 or 20/18 > 15/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18 and 15/21 20/18 and 30/21 20/36 and 15/21 20/18 and 15/42 60/18 and 15/21 20/18 and 45/21 20/54 and 15/21 20/18 and 15/63 20/18 and 75/21 20/90 and 15/21