Subtract 7/81 from 2/9
2/9 - 7/81 is 11/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 81 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 9 × 9 = 81,
2/9 = 2 × 9/9 × 9 = 18/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
7/81 = 7 × 1/81 × 1 = 7/81 - Subtract the two like fractions:
18/81 - 7/81 = 18 - 7/81 = 11/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/9-7/81 2/9-14/81 2/18-7/81 6/9-7/81 2/9-21/81 2/27-7/81 10/9-7/81 2/9-35/81 2/45-7/81 14/9-7/81 2/9-49/81 2/63-7/81