Subtract 5/12 from 8/81
8/81 - 5/12 is -103/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 12 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
8/81 = 8 × 4/81 × 4 = 32/324 - Likewise, for the 2nd fraction, since 12 × 27 = 324,
5/12 = 5 × 27/12 × 27 = 135/324 - Subtract the two like fractions:
32/324 - 135/324 = 32 - 135/324 = -103/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/81-5/12 8/81-10/12 8/81-5/24 24/81-5/12 8/81-15/12 8/81-5/36 40/81-5/12 8/81-25/12 8/81-5/60 56/81-5/12 8/81-35/12 8/81-5/84