Subtract 15/10 from 20/18
1st number: 1 2/18, 2nd number: 1 5/10
20/18 - 15/10 is -7/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
20/18 = 20 × 5/18 × 5 = 100/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
15/10 = 15 × 9/10 × 9 = 135/90 - Subtract the two like fractions:
100/90 - 135/90 = 100 - 135/90 = -35/90 - After reducing the fraction, the answer is -7/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18-15/10 20/18-30/10 20/36-15/10 20/18-15/20 60/18-15/10 20/18-45/10 20/54-15/10 20/18-15/30 20/18-75/10 20/90-15/10 20/18-15/50 20/18-15/70