Subtract 18/8 from 8/7
1st number: 1 1/7, 2nd number: 2 2/8
8/7 - 18/8 is -31/28.
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,
18/8 = 18 × 7/8 × 7 = 126/56 - Subtract the two like fractions:
64/56 - 126/56 = 64 - 126/56 = -62/56 - After reducing the fraction, the answer is -31/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/7-18/8 8/7-36/8 8/14-18/8 8/7-18/16 24/7-18/8 8/7-54/8 8/21-18/8 8/7-18/24 40/7-18/8 8/7-90/8 8/35-18/8 8/7-18/40 56/7-18/8 8/49-18/8 8/7-18/56