Subtract 20/8 from 8/7
1st number: 1 1/7, 2nd number: 2 4/8
8/7 - 20/8 is -19/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
8/7 = 8 × 8/7 × 8 = 64/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
20/8 = 20 × 7/8 × 7 = 140/56 - Subtract the two like fractions:
64/56 - 140/56 = 64 - 140/56 = -76/56 - After reducing the fraction, the answer is -19/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-20/8 8/7-40/8 8/14-20/8 8/7-20/16 24/7-20/8 8/7-60/8 8/21-20/8 8/7-20/24 40/7-20/8 8/35-20/8 8/7-20/40 56/7-20/8 8/49-20/8 8/7-20/56