Subtract 21/5 from 21/56
1st number: 21/56, 2nd number: 4 1/5
21/56 - 21/5 is -153/40.
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,
21/5 = 21 × 56/5 × 56 = 1176/280 - Subtract the two like fractions:
105/280 - 1176/280 = 105 - 1176/280 = -1071/280 - After reducing the fraction, the answer is -153/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-21/5 21/56-42/5 21/56-21/10 63/56-21/5 21/56-63/5 21/56-21/15 21/56-21/25 21/56-21/35