Subtract 9/18 from 1/5
1/5 - 9/18 is -3/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
1/5 = 1 × 18/5 × 18 = 18/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
9/18 = 9 × 5/18 × 5 = 45/90 - Subtract the two like fractions:
18/90 - 45/90 = 18 - 45/90 = -27/90 - After reducing the fraction, the answer is -3/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/5-9/18 1/10-9/18 1/5-9/36 3/5-9/18 1/5-27/18 1/15-9/18 1/5-9/54 1/5-45/18 1/25-9/18 1/5-9/90 7/5-9/18 1/5-63/18 1/35-9/18