Subtract 90/18 from 20/9
1st number: 2 2/9, 2nd number: 5 0/18
20/9 - 90/18 is -25/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 9 × 2 = 18,
20/9 = 20 × 2/9 × 2 = 40/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
90/18 = 90 × 1/18 × 1 = 90/18 - Subtract the two like fractions:
40/18 - 90/18 = 40 - 90/18 = -50/18 - After reducing the fraction, the answer is -25/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/9-90/18 20/18-90/18 20/9-90/36 60/9-90/18 20/27-90/18 20/9-90/54 20/45-90/18 20/63-90/18