Subtract 50/81 from 20/12
1st number: 1 8/12, 2nd number: 50/81
20/12 - 50/81 is 85/81.
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,
20/12 = 20 × 27/12 × 27 = 540/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
50/81 = 50 × 4/81 × 4 = 200/324 - Subtract the two like fractions:
540/324 - 200/324 = 540 - 200/324 = 340/324 - After reducing the fraction, the answer is 85/81
- In mixed form: 14/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12-50/81 20/24-50/81 60/12-50/81 20/36-50/81 20/60-50/81 20/84-50/81