Subtract 18/12 from 15/81
1st number: 15/81, 2nd number: 1 6/12
15/81 - 18/12 is -71/54.
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,
15/81 = 15 × 4/81 × 4 = 60/324 - Likewise, for the 2nd fraction, since 12 × 27 = 324,
18/12 = 18 × 27/12 × 27 = 486/324 - Subtract the two like fractions:
60/324 - 486/324 = 60 - 486/324 = -426/324 - After reducing the fraction, the answer is -71/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81-18/12 15/81-36/12 15/81-18/24 45/81-18/12 15/81-54/12 15/81-18/36 75/81-18/12 15/81-90/12 15/81-18/60 15/81-18/84