Subtract 8/81 from 9/18
9/18 - 8/81 is 65/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 18 × 9 = 162,
9/18 = 9 × 9/18 × 9 = 81/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
8/81 = 8 × 2/81 × 2 = 16/162 - Subtract the two like fractions:
81/162 - 16/162 = 81 - 16/162 = 65/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 9/18-16/81 9/36-8/81 27/18-8/81 9/18-24/81 9/54-8/81 45/18-8/81 9/18-40/81 9/90-8/81 63/18-8/81 9/18-56/81