Subtract 90/8 from 8/15
1st number: 8/15, 2nd number: 11 2/8
8/15 - 90/8 is -643/60.
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,
8/15 = 8 × 8/15 × 8 = 64/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
90/8 = 90 × 15/8 × 15 = 1350/120 - Subtract the two like fractions:
64/120 - 1350/120 = 64 - 1350/120 = -1286/120 - After reducing the fraction, the answer is -643/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-90/8 8/30-90/8 8/15-90/16 24/15-90/8 8/45-90/8 8/15-90/24 40/15-90/8 8/75-90/8 8/15-90/40 56/15-90/8 8/15-90/56