Subtract 8/81 from 7/12
7/12 - 8/81 is 157/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 12 × 27 = 324,
7/12 = 7 × 27/12 × 27 = 189/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
8/81 = 8 × 4/81 × 4 = 32/324 - Subtract the two like fractions:
189/324 - 32/324 = 189 - 32/324 = 157/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/12-8/81 7/12-16/81 7/24-8/81 21/12-8/81 7/12-24/81 7/36-8/81 35/12-8/81 7/12-40/81 7/60-8/81 49/12-8/81 7/12-56/81 7/84-8/81