Subtract 56/12 from 20/21
1st number: 20/21, 2nd number: 4 8/12
20/21 - 56/12 is -26/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
56/12 = 56 × 7/12 × 7 = 392/84 - Subtract the two like fractions:
80/84 - 392/84 = 80 - 392/84 = -312/84 - After reducing the fraction, the answer is -26/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-56/12 20/42-56/12 20/21-56/24 60/21-56/12 20/63-56/12 20/21-56/36 20/21-56/60 20/21-56/84