Subtract 1/5 from 5/81
5/81 - 1/5 is -56/405.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 5 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
5/81 = 5 × 5/81 × 5 = 25/405 - Likewise, for the 2nd fraction, since 5 × 81 = 405,
1/5 = 1 × 81/5 × 81 = 81/405 - Subtract the two like fractions:
25/405 - 81/405 = 25 - 81/405 = -56/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/81-1/5 5/81-2/5 5/81-1/10 15/81-1/5 5/81-3/5 5/81-1/15 25/81-1/5 5/81-1/25 35/81-1/5 5/81-7/5 5/81-1/35