Subtract 8/9 from 7/90
7/90 - 8/9 is -73/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
7/90 = 7 × 1/90 × 1 = 7/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
8/9 = 8 × 10/9 × 10 = 80/90 - Subtract the two like fractions:
7/90 - 80/90 = 7 - 80/90 = -73/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/90-8/9 7/90-16/9 7/90-8/18 21/90-8/9 7/90-24/9 7/90-8/27 35/90-8/9 7/90-40/9 7/90-8/45 49/90-8/9 7/90-56/9 7/90-8/63