Compare 15/21 and 12/28
15/21 is greater than 12/28
Steps for comparing fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
12/28 = 12 × 3/28 × 3 = 36/84 - Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
- 60/84 > 36/84 or 15/21 > 12/28
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 12/28 15/21 and 24/28 15/42 and 12/28 15/21 and 12/56 45/21 and 12/28 15/21 and 36/28 15/63 and 12/28 15/21 and 12/84 75/21 and 12/28 15/21 and 60/28 15/21 and 84/28