Subtract 7/81 from 12/15
12/15 - 7/81 is 289/405.
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,
12/15 = 12 × 27/15 × 27 = 324/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
7/81 = 7 × 5/81 × 5 = 35/405 - Subtract the two like fractions:
324/405 - 35/405 = 324 - 35/405 = 289/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/15-7/81 12/15-14/81 12/30-7/81 36/15-7/81 12/15-21/81 12/45-7/81 60/15-7/81 12/15-35/81 12/75-7/81 84/15-7/81 12/15-49/81