Subtract 4/27 from 5/81
5/81 - 4/27 is -7/81.
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,
5/81 = 5 × 1/81 × 1 = 5/81 - Likewise, for the 2nd fraction, since 27 × 3 = 81,
4/27 = 4 × 3/27 × 3 = 12/81 - Subtract the two like fractions:
5/81 - 12/81 = 5 - 12/81 = -7/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/81-4/27 5/81-8/27 5/81-4/54 15/81-4/27 5/81-12/27 5/81-4/81 25/81-4/27 5/81-20/27 35/81-4/27 5/81-28/27