Subtract 20/81 from 6/27
6/27 - 20/81 is -2/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 27 × 3 = 81,
6/27 = 6 × 3/27 × 3 = 18/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
20/81 = 20 × 1/81 × 1 = 20/81 - Subtract the two like fractions:
18/81 - 20/81 = 18 - 20/81 = -2/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/27-20/81 6/27-40/81 6/54-20/81 18/27-20/81 6/27-60/81 6/81-20/81 30/27-20/81 42/27-20/81