Subtract 90/8 from 18/15
1st number: 1 3/15, 2nd number: 11 2/8
18/15 - 90/8 is -201/20.
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,
90/8 = 90 × 15/8 × 15 = 1350/120 - Subtract the two like fractions:
144/120 - 1350/120 = 144 - 1350/120 = -1206/120 - After reducing the fraction, the answer is -201/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15-90/8 18/30-90/8 18/15-90/16 54/15-90/8 18/45-90/8 18/15-90/24 90/15-90/8 18/75-90/8 18/15-90/40 18/15-90/56