Subtract 56/15 from 20/42
1st number: 20/42, 2nd number: 3 11/15
20/42 - 56/15 is -114/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
20/42 = 20 × 5/42 × 5 = 100/210 - Likewise, for the 2nd fraction, since 15 × 14 = 210,
56/15 = 56 × 14/15 × 14 = 784/210 - Subtract the two like fractions:
100/210 - 784/210 = 100 - 784/210 = -684/210 - After reducing the fraction, the answer is -114/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-56/15 20/84-56/15 20/42-56/30 60/42-56/15 20/42-56/45 20/42-56/75