Compare 21/7 and 28/18
1st number: 3 0/7, 2nd number: 1 10/18
21/7 is greater than 28/18
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 7 × 18 = 126,
21/7 = 21 × 18/7 × 18 = 378/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
28/18 = 28 × 7/18 × 7 = 196/126 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 378/126 > 196/126 or 21/7 > 28/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7 and 28/18 21/7 and 56/18 21/14 and 28/18 21/7 and 28/36 63/7 and 28/18 21/7 and 84/18 21/7 and 28/54 21/35 and 28/18 21/7 and 28/90 21/49 and 28/18