Subtract 7/18 from 9/20
9/20 - 7/18 is 11/180.
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,
7/18 = 7 × 10/18 × 10 = 70/180 - Subtract the two like fractions:
81/180 - 70/180 = 81 - 70/180 = 11/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/20-7/18 9/20-14/18 9/40-7/18 9/20-7/36 27/20-7/18 9/20-21/18 9/60-7/18 9/20-7/54 45/20-7/18 9/20-35/18 9/20-7/90 63/20-7/18 9/20-49/18