Subtract 4/5 from 21/56
21/56 - 4/5 is -17/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 5 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Likewise, for the 2nd fraction, since 5 × 56 = 280,
4/5 = 4 × 56/5 × 56 = 224/280 - Subtract the two like fractions:
105/280 - 224/280 = 105 - 224/280 = -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: 42/56-4/5 21/56-8/5 21/56-4/10 63/56-4/5 21/56-12/5 21/56-4/15 21/56-20/5 21/56-4/25 21/56-28/5 21/56-4/35