Subtract 56/21 from 7/20
1st number: 7/20, 2nd number: 2 14/21
7/20 - 56/21 is -139/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
7/20 = 7 × 21/20 × 21 = 147/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
56/21 = 56 × 20/21 × 20 = 1120/420 - Subtract the two like fractions:
147/420 - 1120/420 = 147 - 1120/420 = -973/420 - After reducing the fraction, the answer is -139/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20-56/21 7/40-56/21 7/20-56/42 21/20-56/21 7/60-56/21 7/20-56/63 35/20-56/21 49/20-56/21