Subtract 90/8 from 20/18
1st number: 1 2/18, 2nd number: 11 2/8
20/18 - 90/8 is -365/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
20/18 = 20 × 4/18 × 4 = 80/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
90/8 = 90 × 9/8 × 9 = 810/72 - Subtract the two like fractions:
80/72 - 810/72 = 80 - 810/72 = -730/72 - After reducing the fraction, the answer is -365/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18-90/8 20/36-90/8 20/18-90/16 60/18-90/8 20/54-90/8 20/18-90/24 20/90-90/8 20/18-90/40 20/18-90/56