Subtract 90/12 from 8/15
1st number: 8/15, 2nd number: 7 6/12
8/15 - 90/12 is -209/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 12 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
8/15 = 8 × 4/15 × 4 = 32/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
90/12 = 90 × 5/12 × 5 = 450/60 - Subtract the two like fractions:
32/60 - 450/60 = 32 - 450/60 = -418/60 - After reducing the fraction, the answer is -209/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-90/12 8/30-90/12 8/15-90/24 24/15-90/12 8/45-90/12 8/15-90/36 40/15-90/12 8/75-90/12 8/15-90/60 56/15-90/12 8/15-90/84