Subtract 15/8 from 18/15
1st number: 1 3/15, 2nd number: 1 7/8
18/15 - 15/8 is -27/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
18/15 = 18 × 8/15 × 8 = 144/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
15/8 = 15 × 15/8 × 15 = 225/120 - Subtract the two like fractions:
144/120 - 225/120 = 144 - 225/120 = -81/120 - After reducing the fraction, the answer is -27/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15-15/8 18/15-30/8 18/30-15/8 18/15-15/16 54/15-15/8 18/15-45/8 18/45-15/8 18/15-15/24 90/15-15/8 18/15-75/8 18/75-15/8 18/15-15/40 18/15-15/56