Answers

Subtract 27/81 from 15/75

15/75 - 27/81 is -2/15.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 81 is 2025
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2025
2. For the 1st fraction, since 75 × 27 = 2025,
   15/75 = 15 × 27/75 × 27 = 405/2025
3. Likewise, for the 2nd fraction, since 81 × 25 = 2025,
   27/81 = 27 × 25/81 × 25 = 675/2025
4. Subtract the two like fractions:
   405/2025 - 675/2025 = 405 - 675/2025 = -270/2025
5. After reducing the fraction, the answer is -2/15

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related: ³⁰/₇₅-²⁷/₈₁ ¹⁵/₇₅-⁵⁴/₈₁ ⁴⁵/₇₅-²⁷/₈₁

Subtract Fractions Calculator