Answers

Subtract 49/81 from 9/15

9/15 - 49/81 is -2/405.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 81 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 15 × 27 = 405,
   9/15 = 9 × 27/15 × 27 = 243/405
3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
   49/81 = 49 × 5/81 × 5 = 245/405
4. Subtract the two like fractions:
   243/405 - 245/405 = 243 - 245/405 = -2/405

MathStep (Works offline)

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

Related: ¹⁸/₁₅-⁴⁹/₈₁ ⁹/₁₅-⁹⁸/₈₁ ⁹/₃₀-⁴⁹/₈₁ ²⁷/₁₅-⁴⁹/₈₁ ⁹/₄₅-⁴⁹/₈₁ ⁴⁵/₁₅-⁴⁹/₈₁ ⁹/₇₅-⁴⁹/₈₁ ⁶³/₁₅-⁴⁹/₈₁

Subtract Fractions Calculator