Subtract 1/81 from 1/15
1/15 - 1/81 is 22/405.
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,
1/15 = 1 × 27/15 × 27 = 27/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
1/81 = 1 × 5/81 × 5 = 5/405 - Subtract the two like fractions:
27/405 - 5/405 = 27 - 5/405 = 22/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/15-1/81 1/15-2/81 1/30-1/81 3/15-1/81 1/15-3/81 1/45-1/81 5/15-1/81 1/15-5/81 1/75-1/81 7/15-1/81 1/15-7/81