Subtract 81/9 from 20/90
1st number: 20/90, 2nd number: 9 0/9
20/90 - 81/9 is -79/9.
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,
20/90 = 20 × 1/90 × 1 = 20/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
81/9 = 81 × 10/9 × 10 = 810/90 - Subtract the two like fractions:
20/90 - 810/90 = 20 - 810/90 = -790/90 - After reducing the fraction, the answer is -79/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90-81/9 20/90-81/18 60/90-81/9 20/90-81/27 20/90-81/45 20/90-81/63