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Subtract 18/81 from 9/15

9/15 - 18/81 is 17/45.

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,
    18/81 = 18 × 5/81 × 5 = 90/405
  4. Subtract the two like fractions:
    243/405 - 90/405 = 243 - 90/405 = 153/405
  5. After reducing the fraction, the answer is 17/45

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