Subtract 5/18 from 1/81
1/81 - 5/18 is -43/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 18 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
1/81 = 1 × 2/81 × 2 = 2/162 - Likewise, for the 2nd fraction, since 18 × 9 = 162,
5/18 = 5 × 9/18 × 9 = 45/162 - Subtract the two like fractions:
2/162 - 45/162 = 2 - 45/162 = -43/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/81-5/18 1/81-10/18 1/81-5/36 3/81-5/18 1/81-15/18 1/81-5/54 5/81-5/18 1/81-25/18 1/81-5/90 7/81-5/18 1/81-35/18