Subtract 90/12 from 7/9
1st number: 7/9, 2nd number: 7 6/12
7/9 - 90/12 is -121/18.
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,
7/9 = 7 × 4/9 × 4 = 28/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
90/12 = 90 × 3/12 × 3 = 270/36 - Subtract the two like fractions:
28/36 - 270/36 = 28 - 270/36 = -242/36 - After reducing the fraction, the answer is -121/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/9-90/12 7/18-90/12 7/9-90/24 21/9-90/12 7/27-90/12 7/9-90/36 35/9-90/12 7/45-90/12 7/9-90/60 49/9-90/12 7/63-90/12 7/9-90/84