Subtract 3/5 from 4/81
4/81 - 3/5 is -223/405.
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,
4/81 = 4 × 5/81 × 5 = 20/405 - Likewise, for the 2nd fraction, since 5 × 81 = 405,
3/5 = 3 × 81/5 × 81 = 243/405 - Subtract the two like fractions:
20/405 - 243/405 = 20 - 243/405 = -223/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/81-3/5 4/81-6/5 4/81-3/10 12/81-3/5 4/81-9/5 4/81-3/15 20/81-3/5 4/81-15/5 4/81-3/25 28/81-3/5 4/81-21/5 4/81-3/35