Subtract 56/15 from 7/81
1st number: 7/81, 2nd number: 3 11/15
7/81 - 56/15 is -1477/405.
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,
7/81 = 7 × 5/81 × 5 = 35/405 - Likewise, for the 2nd fraction, since 15 × 27 = 405,
56/15 = 56 × 27/15 × 27 = 1512/405 - Subtract the two like fractions:
35/405 - 1512/405 = 35 - 1512/405 = -1477/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/81-56/15 7/81-56/30 21/81-56/15 7/81-56/45 35/81-56/15 7/81-56/75 49/81-56/15