Subtract 28/18 from 18/27
1st number: 18/27, 2nd number: 1 10/18
18/27 - 28/18 is -8/9.
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,
28/18 = 28 × 3/18 × 3 = 84/54 - Subtract the two like fractions:
36/54 - 84/54 = 36 - 84/54 = -48/54 - After reducing the fraction, the answer is -8/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/27-28/18 18/27-56/18 18/54-28/18 18/27-28/36 54/27-28/18 18/27-84/18 18/81-28/18 18/27-28/54 90/27-28/18 18/27-28/90