Subtract 8/5 from 40/81
1st number: 40/81, 2nd number: 1 3/5
40/81 - 8/5 is -448/405.
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,
40/81 = 40 × 5/81 × 5 = 200/405 - Likewise, for the 2nd fraction, since 5 × 81 = 405,
8/5 = 8 × 81/5 × 81 = 648/405 - Subtract the two like fractions:
200/405 - 648/405 = 200 - 648/405 = -448/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/81-8/5 40/81-16/5 40/81-8/10 40/81-24/5 40/81-8/15 40/81-40/5 40/81-8/25 40/81-56/5 40/81-8/35