Subtract 25/20 from 15/28
1st number: 15/28, 2nd number: 1 5/20
15/28 - 25/20 is -5/7.
Steps for subtracting 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,
15/28 = 15 × 5/28 × 5 = 75/140 - Likewise, for the 2nd fraction, since 20 × 7 = 140,
25/20 = 25 × 7/20 × 7 = 175/140 - Subtract the two like fractions:
75/140 - 175/140 = 75 - 175/140 = -100/140 - After reducing the fraction, the answer is -5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28-25/20 15/28-50/20 15/56-25/20 15/28-25/40 45/28-25/20 15/28-75/20 15/84-25/20 15/28-25/60 75/28-25/20