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Subtract 25/27 from 30/42

30/42 - 25/27 is -40/189.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 27 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 42 × 9 = 378,
    30/42 = 30 × 9/42 × 9 = 270/378
  3. Likewise, for the 2nd fraction, since 27 × 14 = 378,
    25/27 = 25 × 14/27 × 14 = 350/378
  4. Subtract the two like fractions:
    270/378 - 350/378 = 270 - 350/378 = -80/378
  5. After reducing the fraction, the answer is -40/189

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