Subtract 15/20 from 10/18
10/18 - 15/20 is -7/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 18 × 10 = 180,
10/18 = 10 × 10/18 × 10 = 100/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
15/20 = 15 × 9/20 × 9 = 135/180 - Subtract the two like fractions:
100/180 - 135/180 = 100 - 135/180 = -35/180 - After reducing the fraction, the answer is -7/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/18-15/20 10/18-30/20 10/36-15/20 10/18-15/40 30/18-15/20 10/18-45/20 10/54-15/20 10/18-15/60 50/18-15/20 10/18-75/20 10/90-15/20 70/18-15/20