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