Subtract 20/15 from 15/28
1st number: 15/28, 2nd number: 1 5/15
15/28 - 20/15 is -67/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
15/28 = 15 × 15/28 × 15 = 225/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
20/15 = 20 × 28/15 × 28 = 560/420 - Subtract the two like fractions:
225/420 - 560/420 = 225 - 560/420 = -335/420 - After reducing the fraction, the answer is -67/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28-20/15 15/28-40/15 15/56-20/15 15/28-20/30 45/28-20/15 15/28-60/15 15/84-20/15 15/28-20/45 75/28-20/15 15/28-20/75