Subtract 7/81 from 7/9
7/9 - 7/81 is 56/81.
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,
7/9 = 7 × 9/9 × 9 = 63/81 - Likewise, for the 2nd fraction, since 81 × 1 = 81,
7/81 = 7 × 1/81 × 1 = 7/81 - Subtract the two like fractions:
63/81 - 7/81 = 63 - 7/81 = 56/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/9-7/81 7/9-14/81 7/18-7/81 21/9-7/81 7/9-21/81 7/27-7/81 35/9-7/81 7/9-35/81 7/45-7/81 49/9-7/81 7/9-49/81 7/63-7/81