Subtract 12/81 from 18/15
1st number: 1 3/15, 2nd number: 12/81
18/15 - 12/81 is 142/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
18/15 = 18 × 27/15 × 27 = 486/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
12/81 = 12 × 5/81 × 5 = 60/405 - Subtract the two like fractions:
486/405 - 60/405 = 486 - 60/405 = 426/405 - After reducing the fraction, the answer is 142/135
- In mixed form: 17/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/15-12/81 18/15-24/81 18/30-12/81 54/15-12/81 18/15-36/81 18/45-12/81 90/15-12/81 18/15-60/81 18/75-12/81 18/15-84/81