Compare 21/28 and 9/20
21/28 is greater than 9/20
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 20 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
9/20 = 9 × 7/20 × 7 = 63/140 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 105/140 > 63/140 or 21/28 > 9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28 and 9/20 21/28 and 18/20 21/56 and 9/20 21/28 and 9/40 63/28 and 9/20 21/28 and 27/20 21/84 and 9/20 21/28 and 9/60 21/28 and 45/20 21/28 and 63/20