Subtract 56/12 from 7/21
1st number: 7/21, 2nd number: 4 8/12
7/21 - 56/12 is -13/3.
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,
7/21 = 7 × 4/21 × 4 = 28/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
56/12 = 56 × 7/12 × 7 = 392/84 - Subtract the two like fractions:
28/84 - 392/84 = 28 - 392/84 = -364/84 - After reducing the fraction, the answer is -13/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-56/12 7/42-56/12 7/21-56/24 7/63-56/12 7/21-56/36 35/21-56/12 7/21-56/60 49/21-56/12 7/21-56/84