Subtract 20/15 from 1/18
1st number: 1/18, 2nd number: 1 5/15
1/18 - 20/15 is -23/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 15 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
1/18 = 1 × 5/18 × 5 = 5/90 - Likewise, for the 2nd fraction, since 15 × 6 = 90,
20/15 = 20 × 6/15 × 6 = 120/90 - Subtract the two like fractions:
5/90 - 120/90 = 5 - 120/90 = -115/90 - After reducing the fraction, the answer is -23/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/18-20/15 1/18-40/15 1/36-20/15 1/18-20/30 3/18-20/15 1/18-60/15 1/54-20/15 1/18-20/45 5/18-20/15 1/90-20/15 1/18-20/75 7/18-20/15