Subtract 15/18 from 1/20
1/20 - 15/18 is -47/60.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 18 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
1/20 = 1 × 9/20 × 9 = 9/180 - Likewise, for the 2nd fraction, since 18 × 10 = 180,
15/18 = 15 × 10/18 × 10 = 150/180 - Subtract the two like fractions:
9/180 - 150/180 = 9 - 150/180 = -141/180 - After reducing the fraction, the answer is -47/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/20-15/18 1/20-30/18 1/40-15/18 1/20-15/36 3/20-15/18 1/20-45/18 1/60-15/18 1/20-15/54 5/20-15/18 1/20-75/18 1/20-15/90 7/20-15/18