Subtract 28/56 from 3/18
3/18 - 28/56 is -1/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 56 is 504
Next, find the equivalent fraction of both fractional numbers with denominator 504 - For the 1st fraction, since 18 × 28 = 504,
3/18 = 3 × 28/18 × 28 = 84/504 - Likewise, for the 2nd fraction, since 56 × 9 = 504,
28/56 = 28 × 9/56 × 9 = 252/504 - Subtract the two like fractions:
84/504 - 252/504 = 84 - 252/504 = -168/504 - After reducing the fraction, the answer is -1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18-28/56 3/36-28/56 9/18-28/56 3/18-84/56 3/54-28/56 15/18-28/56 3/90-28/56 21/18-28/56