Subtract 1/5 from 21/56
21/56 - 1/5 is 7/40.
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,
1/5 = 1 × 56/5 × 56 = 56/280 - Subtract the two like fractions:
105/280 - 56/280 = 105 - 56/280 = 49/280 - After reducing the fraction, the answer is 7/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-1/5 21/56-2/5 21/56-1/10 63/56-1/5 21/56-3/5 21/56-1/15 21/56-1/25 21/56-7/5 21/56-1/35