Subtract 18/15 from 7/8
1st number: 7/8, 2nd number: 1 3/15
7/8 - 18/15 is -13/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 15 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 8 × 15 = 120,
7/8 = 7 × 15/8 × 15 = 105/120 - Likewise, for the 2nd fraction, since 15 × 8 = 120,
18/15 = 18 × 8/15 × 8 = 144/120 - Subtract the two like fractions:
105/120 - 144/120 = 105 - 144/120 = -39/120 - After reducing the fraction, the answer is -13/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/8-18/15 7/8-36/15 7/16-18/15 7/8-18/30 21/8-18/15 7/8-54/15 7/24-18/15 7/8-18/45 35/8-18/15 7/8-90/15 7/40-18/15 7/8-18/75 49/8-18/15 7/56-18/15