Subtract 15/9 from 18/20
1st number: 18/20, 2nd number: 1 6/9
18/20 - 15/9 is -23/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
18/20 = 18 × 9/20 × 9 = 162/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
15/9 = 15 × 20/9 × 20 = 300/180 - Subtract the two like fractions:
162/180 - 300/180 = 162 - 300/180 = -138/180 - After reducing the fraction, the answer is -23/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20-15/9 18/20-30/9 18/40-15/9 18/20-15/18 54/20-15/9 18/20-45/9 18/60-15/9 18/20-15/27 90/20-15/9 18/20-75/9 18/20-15/45 18/20-15/63