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Subtract 3/81 from 5/7

5/7 - 3/81 is 128/189.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 81 is 567

    Next, find the equivalent fraction of both fractional numbers with denominator 567
  2. For the 1st fraction, since 7 × 81 = 567,
    5/7 = 5 × 81/7 × 81 = 405/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    3/81 = 3 × 7/81 × 7 = 21/567
  4. Subtract the two like fractions:
    405/567 - 21/567 = 405 - 21/567 = 384/567
  5. After reducing the fraction, the answer is 128/189

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