Subtract 28/27 from 18/84
1st number: 18/84, 2nd number: 1 1/27
18/84 - 28/27 is -311/378.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 27 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 84 × 9 = 756,
18/84 = 18 × 9/84 × 9 = 162/756 - Likewise, for the 2nd fraction, since 27 × 28 = 756,
28/27 = 28 × 28/27 × 28 = 784/756 - Subtract the two like fractions:
162/756 - 784/756 = 162 - 784/756 = -622/756 - After reducing the fraction, the answer is -311/378
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/84-28/27 18/84-56/27 18/84-28/54 54/84-28/27 18/84-84/27 18/84-28/81 90/84-28/27