Subtract 5/81 from 5/2
1st number: 2 1/2, 2nd number: 5/81
5/2 - 5/81 is 395/162.
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,
5/2 = 5 × 81/2 × 81 = 405/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
5/81 = 5 × 2/81 × 2 = 10/162 - Subtract the two like fractions:
405/162 - 10/162 = 405 - 10/162 = 395/162 - In mixed form: 271/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/2-5/81 5/2-10/81 5/4-5/81 15/2-5/81 5/2-15/81 5/6-5/81 25/2-5/81 5/2-25/81 5/10-5/81 35/2-5/81 5/2-35/81 5/14-5/81