Subtract 15/9 from 56/81
1st number: 56/81, 2nd number: 1 6/9
56/81 - 15/9 is -79/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 9 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 81 × 1 = 81,
56/81 = 56 × 1/81 × 1 = 56/81 - Likewise, for the 2nd fraction, since 9 × 9 = 81,
15/9 = 15 × 9/9 × 9 = 135/81 - Subtract the two like fractions:
56/81 - 135/81 = 56 - 135/81 = -79/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/81-30/9 56/81-15/18 56/81-45/9 56/81-15/27 56/81-75/9 56/81-15/45 56/81-15/63