Subtract 7/20 from 21/56
21/56 - 7/20 is 1/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 20 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 20 × 14 = 280,
7/20 = 7 × 14/20 × 14 = 98/280 - Subtract the two like fractions:
105/280 - 98/280 = 105 - 98/280 = 7/280 - After reducing the fraction, the answer is 1/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/56-7/20 21/56-14/20 21/56-7/40 63/56-7/20 21/56-21/20 21/56-7/60 21/56-35/20 21/56-49/20