Subtract 28/40 from 15/28
15/28 - 28/40 is -23/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
15/28 = 15 × 10/28 × 10 = 150/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
28/40 = 28 × 7/40 × 7 = 196/280 - Subtract the two like fractions:
150/280 - 196/280 = 150 - 196/280 = -46/280 - After reducing the fraction, the answer is -23/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28-28/40 15/28-56/40 15/56-28/40 15/28-28/80 45/28-28/40 15/28-84/40 15/84-28/40 75/28-28/40