Subtract 75/81 from 8/5
1st number: 1 3/5, 2nd number: 75/81
8/5 - 75/81 is 91/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
8/5 = 8 × 81/5 × 81 = 648/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
75/81 = 75 × 5/81 × 5 = 375/405 - Subtract the two like fractions:
648/405 - 375/405 = 648 - 375/405 = 273/405 - After reducing the fraction, the answer is 91/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/5-75/81 8/10-75/81 24/5-75/81 8/15-75/81 40/5-75/81 8/25-75/81 56/5-75/81 8/35-75/81