Subtract 21/9 from 8/90
1st number: 8/90, 2nd number: 2 3/9
8/90 - 21/9 is -101/45.
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,
8/90 = 8 × 1/90 × 1 = 8/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
21/9 = 21 × 10/9 × 10 = 210/90 - Subtract the two like fractions:
8/90 - 210/90 = 8 - 210/90 = -202/90 - After reducing the fraction, the answer is -101/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/90-21/9 8/90-42/9 8/90-21/18 24/90-21/9 8/90-63/9 8/90-21/27 40/90-21/9 8/90-21/45 56/90-21/9 8/90-21/63