Subtract 18/81 from 1/2
1/2 - 18/81 is 5/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 2 × 81 = 162,
1/2 = 1 × 81/2 × 81 = 81/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
18/81 = 18 × 2/81 × 2 = 36/162 - Subtract the two like fractions:
81/162 - 36/162 = 81 - 36/162 = 45/162 - After reducing the fraction, the answer is 5/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 1/2-36/81 1/4-18/81 3/2-18/81 1/2-54/81 1/6-18/81 5/2-18/81 1/2-90/81 1/10-18/81 7/2-18/81 1/14-18/81