Subtract 90/12 from 30/15
1st number: 2 0/15, 2nd number: 7 6/12
30/15 - 90/12 is -11/2.
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,
30/15 = 30 × 4/15 × 4 = 120/60 - Likewise, for the 2nd fraction, since 12 × 5 = 60,
90/12 = 90 × 5/12 × 5 = 450/60 - Subtract the two like fractions:
120/60 - 450/60 = 120 - 450/60 = -330/60 - After reducing the fraction, the answer is -11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15-90/12 30/15-90/24 90/15-90/12 30/45-90/12 30/15-90/36 30/75-90/12 30/15-90/60 30/15-90/84