Subtract 10/81 from 7/15
7/15 - 10/81 is 139/405.
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,
7/15 = 7 × 27/15 × 27 = 189/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
10/81 = 10 × 5/81 × 5 = 50/405 - Subtract the two like fractions:
189/405 - 50/405 = 189 - 50/405 = 139/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/15-10/81 7/15-20/81 7/30-10/81 21/15-10/81 7/15-30/81 7/45-10/81 35/15-10/81 7/15-50/81 7/75-10/81 49/15-10/81 7/15-70/81