Subtract 15/18 from 18/27
18/27 - 15/18 is -1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 18 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 27 × 2 = 54,
18/27 = 18 × 2/27 × 2 = 36/54 - Likewise, for the 2nd fraction, since 18 × 3 = 54,
15/18 = 15 × 3/18 × 3 = 45/54 - Subtract the two like fractions:
36/54 - 45/54 = 36 - 45/54 = -9/54 - After reducing the fraction, the answer is -1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/27-15/18 18/27-30/18 18/54-15/18 18/27-15/36 54/27-15/18 18/27-45/18 18/81-15/18 18/27-15/54 90/27-15/18 18/27-75/18 18/27-15/90