Subtract 28/56 from 3/40
3/40 - 28/56 is -17/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 40 × 7 = 280,
3/40 = 3 × 7/40 × 7 = 21/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
28/56 = 28 × 5/56 × 5 = 140/280 - Subtract the two like fractions:
21/280 - 140/280 = 21 - 140/280 = -119/280 - After reducing the fraction, the answer is -17/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/40-28/56 3/80-28/56 9/40-28/56 3/40-84/56 15/40-28/56 21/40-28/56