Subtract 8/18 from 9/20
9/20 - 8/18 is 1/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
9/20 = 9 × 9/20 × 9 = 81/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
8/18 = 8 × 10/18 × 10 = 80/180 - Subtract the two like fractions:
81/180 - 80/180 = 81 - 80/180 = 1/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-8/18 9/20-16/18 9/40-8/18 9/20-8/36 27/20-8/18 9/20-24/18 9/60-8/18 9/20-8/54 45/20-8/18 9/20-40/18 9/20-8/90 63/20-8/18 9/20-56/18