Subtract 90/12 from 28/9
1st number: 3 1/9, 2nd number: 7 6/12
28/9 - 90/12 is -79/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 9 × 4 = 36,
28/9 = 28 × 4/9 × 4 = 112/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
90/12 = 90 × 3/12 × 3 = 270/36 - Subtract the two like fractions:
112/36 - 270/36 = 112 - 270/36 = -158/36 - After reducing the fraction, the answer is -79/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/9-90/12 28/18-90/12 28/9-90/24 84/9-90/12 28/27-90/12 28/9-90/36 28/45-90/12 28/9-90/60 28/63-90/12 28/9-90/84