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Subtract 30/81 from 7/49

7/49 - 30/81 is -43/189.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 49 and 81 is 3969

    Next, find the equivalent fraction of both fractional numbers with denominator 3969
  2. For the 1st fraction, since 49 × 81 = 3969,
    7/49 = 7 × 81/49 × 81 = 567/3969
  3. Likewise, for the 2nd fraction, since 81 × 49 = 3969,
    30/81 = 30 × 49/81 × 49 = 1470/3969
  4. Subtract the two like fractions:
    567/3969 - 1470/3969 = 567 - 1470/3969 = -903/3969
  5. After reducing the fraction, the answer is -43/189

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