Subtract 20/81 from 8/15
8/15 - 20/81 is 116/405.
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,
8/15 = 8 × 27/15 × 27 = 216/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Subtract the two like fractions:
216/405 - 100/405 = 216 - 100/405 = 116/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/15-20/81 8/15-40/81 8/30-20/81 24/15-20/81 8/15-60/81 8/45-20/81 40/15-20/81 8/75-20/81 56/15-20/81