Subtract 5/81 from 15/12
1st number: 1 3/12, 2nd number: 5/81
15/12 - 5/81 is 385/324.
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,
15/12 = 15 × 27/12 × 27 = 405/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
5/81 = 5 × 4/81 × 4 = 20/324 - Subtract the two like fractions:
405/324 - 20/324 = 405 - 20/324 = 385/324 - In mixed form: 161/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/12-5/81 15/12-10/81 15/24-5/81 45/12-5/81 15/12-15/81 15/36-5/81 75/12-5/81 15/12-25/81 15/60-5/81 15/12-35/81 15/84-5/81