Subtract 10/27 from 20/81
20/81 - 10/27 is -10/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 27 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 81 × 1 = 81,
20/81 = 20 × 1/81 × 1 = 20/81 - Likewise, for the 2nd fraction, since 27 × 3 = 81,
10/27 = 10 × 3/27 × 3 = 30/81 - Subtract the two like fractions:
20/81 - 30/81 = 20 - 30/81 = -10/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81-10/27 20/81-20/27 20/81-10/54 60/81-10/27 20/81-30/27 20/81-10/81 20/81-50/27 20/81-70/27