Subtract 10/81 from 81/12
1st number: 6 9/12, 2nd number: 10/81
81/12 - 10/81 is 2147/324.
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,
81/12 = 81 × 27/12 × 27 = 2187/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
10/81 = 10 × 4/81 × 4 = 40/324 - Subtract the two like fractions:
2187/324 - 40/324 = 2187 - 40/324 = 2147/324 - In mixed form: 6203/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12-20/81 81/24-10/81 81/12-30/81 81/36-10/81 81/12-50/81 81/60-10/81 81/12-70/81 81/84-10/81