Subtract 28/10 from 21/56
1st number: 21/56, 2nd number: 2 8/10
21/56 - 28/10 is -97/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 10 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 10 × 28 = 280,
28/10 = 28 × 28/10 × 28 = 784/280 - Subtract the two like fractions:
105/280 - 784/280 = 105 - 784/280 = -679/280 - After reducing the fraction, the answer is -97/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-28/10 21/56-56/10 21/56-28/20 63/56-28/10 21/56-84/10 21/56-28/30 21/56-28/50 21/56-28/70