Subtract 9/12 from 90/15
1st number: 6 0/15, 2nd number: 9/12
90/15 - 9/12 is 21/4.
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,
90/15 = 90 × 4/15 × 4 = 360/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
9/12 = 9 × 5/12 × 5 = 45/60 - Subtract the two like fractions:
360/60 - 45/60 = 360 - 45/60 = 315/60 - After reducing the fraction, the answer is 21/4
- In mixed form: 51/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/15-18/12 90/30-9/12 90/15-9/24 90/15-27/12 90/45-9/12 90/15-9/36 90/15-45/12 90/75-9/12 90/15-9/60 90/15-63/12 90/15-9/84