Subtract 15/28 from 21/15
1st number: 1 6/15, 2nd number: 15/28
21/15 - 15/28 is 121/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
21/15 = 21 × 28/15 × 28 = 588/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
15/28 = 15 × 15/28 × 15 = 225/420 - Subtract the two like fractions:
588/420 - 225/420 = 588 - 225/420 = 363/420 - After reducing the fraction, the answer is 121/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15-15/28 21/15-30/28 21/30-15/28 21/15-15/56 63/15-15/28 21/15-45/28 21/45-15/28 21/15-15/84 21/15-75/28 21/75-15/28