Subtract 45/56 from 28/70
28/70 - 45/56 is -113/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
28/70 = 28 × 4/70 × 4 = 112/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
45/56 = 45 × 5/56 × 5 = 225/280 - Subtract the two like fractions:
112/280 - 225/280 = 112 - 225/280 = -113/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/70-45/56 28/70-90/56 84/70-45/56