Subtract 18/28 from 1/27
1/27 - 18/28 is -229/378.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 28 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 27 × 28 = 756,
1/27 = 1 × 28/27 × 28 = 28/756 - Likewise, for the 2nd fraction, since 28 × 27 = 756,
18/28 = 18 × 27/28 × 27 = 486/756 - Subtract the two like fractions:
28/756 - 486/756 = 28 - 486/756 = -458/756 - After reducing the fraction, the answer is -229/378
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/27-18/28 1/27-36/28 1/54-18/28 1/27-18/56 3/27-18/28 1/27-54/28 1/81-18/28 1/27-18/84 5/27-18/28 1/27-90/28 7/27-18/28