Subtract 18/15 from 1/81
1st number: 1/81, 2nd number: 1 3/15
1/81 - 18/15 is -481/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 15 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
1/81 = 1 × 5/81 × 5 = 5/405 - Likewise, for the 2nd fraction, since 15 × 27 = 405,
18/15 = 18 × 27/15 × 27 = 486/405 - Subtract the two like fractions:
5/405 - 486/405 = 5 - 486/405 = -481/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/81-18/15 1/81-36/15 1/81-18/30 3/81-18/15 1/81-54/15 1/81-18/45 5/81-18/15 1/81-90/15 1/81-18/75 7/81-18/15