Subtract 15/28 from 7/40
7/40 - 15/28 is -101/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 28 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
7/40 = 7 × 7/40 × 7 = 49/280 - Likewise, for the 2nd fraction, since 28 × 10 = 280,
15/28 = 15 × 10/28 × 10 = 150/280 - Subtract the two like fractions:
49/280 - 150/280 = 49 - 150/280 = -101/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/40-15/28 7/40-30/28 7/80-15/28 7/40-15/56 21/40-15/28 7/40-45/28 7/40-15/84 35/40-15/28 7/40-75/28 49/40-15/28