Subtract 12/9 from 90/75
1st number: 1 15/75, 2nd number: 1 3/9
90/75 - 12/9 is -2/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 9 is 225
Next, find the equivalent fraction of both fractional numbers with denominator 225 - For the 1st fraction, since 75 × 3 = 225,
90/75 = 90 × 3/75 × 3 = 270/225 - Likewise, for the 2nd fraction, since 9 × 25 = 225,
12/9 = 12 × 25/9 × 25 = 300/225 - Subtract the two like fractions:
270/225 - 300/225 = 270 - 300/225 = -30/225 - After reducing the fraction, the answer is -2/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75-24/9 90/75-12/18 90/75-36/9 90/75-12/27 90/75-60/9 90/75-12/45 90/75-84/9 90/75-12/63