Subtract 90/7 from 15/12
1st number: 1 3/12, 2nd number: 12 6/7
15/12 - 90/7 is -325/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
15/12 = 15 × 7/12 × 7 = 105/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
90/7 = 90 × 12/7 × 12 = 1080/84 - Subtract the two like fractions:
105/84 - 1080/84 = 105 - 1080/84 = -975/84 - After reducing the fraction, the answer is -325/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12-90/7 15/24-90/7 15/12-90/14 45/12-90/7 15/36-90/7 15/12-90/21 75/12-90/7 15/60-90/7 15/12-90/35 15/84-90/7 15/12-90/49