Subtract 15/8 from 90/12
1st number: 7 6/12, 2nd number: 1 7/8
90/12 - 15/8 is 45/8.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 8 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 12 × 2 = 24,
90/12 = 90 × 2/12 × 2 = 180/24 - Likewise, for the 2nd fraction, since 8 × 3 = 24,
15/8 = 15 × 3/8 × 3 = 45/24 - Subtract the two like fractions:
180/24 - 45/24 = 180 - 45/24 = 135/24 - After reducing the fraction, the answer is 45/8
- In mixed form: 55/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-30/8 90/24-15/8 90/12-15/16 90/12-45/8 90/36-15/8 90/12-15/24 90/12-75/8 90/60-15/8 90/12-15/40 90/84-15/8 90/12-15/56