Subtract 56/12 from 15/21
1st number: 15/21, 2nd number: 4 8/12
15/21 - 56/12 is -83/21.
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,
15/21 = 15 × 4/21 × 4 = 60/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
56/12 = 56 × 7/12 × 7 = 392/84 - Subtract the two like fractions:
60/84 - 392/84 = 60 - 392/84 = -332/84 - After reducing the fraction, the answer is -83/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21-56/12 15/42-56/12 15/21-56/24 45/21-56/12 15/63-56/12 15/21-56/36 75/21-56/12 15/21-56/60 15/21-56/84