Subtract 20/56 from 15/70
15/70 - 20/56 is -1/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 70 × 4 = 280,
15/70 = 15 × 4/70 × 4 = 60/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
20/56 = 20 × 5/56 × 5 = 100/280 - Subtract the two like fractions:
60/280 - 100/280 = 60 - 100/280 = -40/280 - After reducing the fraction, the answer is -1/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70-20/56 15/70-40/56 45/70-20/56 15/70-60/56 75/70-20/56