Subtract 25/20 from 15/18
1st number: 15/18, 2nd number: 1 5/20
15/18 - 25/20 is -5/12.
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,
15/18 = 15 × 10/18 × 10 = 150/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
25/20 = 25 × 9/20 × 9 = 225/180 - Subtract the two like fractions:
150/180 - 225/180 = 150 - 225/180 = -75/180 - After reducing the fraction, the answer is -5/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-25/20 15/18-50/20 15/36-25/20 15/18-25/40 45/18-25/20 15/18-75/20 15/54-25/20 15/18-25/60 75/18-25/20 15/90-25/20