Subtract 15/18 from 12/27
12/27 - 15/18 is -7/18.
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,
12/27 = 12 × 2/27 × 2 = 24/54 - Likewise, for the 2nd fraction, since 18 × 3 = 54,
15/18 = 15 × 3/18 × 3 = 45/54 - Subtract the two like fractions:
24/54 - 45/54 = 24 - 45/54 = -21/54 - 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: 24/27-15/18 12/27-30/18 12/54-15/18 12/27-15/36 36/27-15/18 12/27-45/18 12/81-15/18 12/27-15/54 60/27-15/18 12/27-75/18 12/27-15/90 84/27-15/18