Subtract 56/21 from 15/18
1st number: 15/18, 2nd number: 2 14/21
15/18 - 56/21 is -11/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
15/18 = 15 × 7/18 × 7 = 105/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
56/21 = 56 × 6/21 × 6 = 336/126 - Subtract the two like fractions:
105/126 - 336/126 = 105 - 336/126 = -231/126 - After reducing the fraction, the answer is -11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-56/21 15/36-56/21 15/18-56/42 45/18-56/21 15/54-56/21 15/18-56/63 75/18-56/21 15/90-56/21