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Subtract 12/27 from 5/42

5/42 - 12/27 is -41/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 27 is 378
  2. For the 1st fraction, since 42 × 9 = 378,
    5/42 = 5 × 9/42 × 9 = 45/378
  3. Likewise, for the 2nd fraction, since 27 × 14 = 378,
    12/27 = 12 × 14/27 × 14 = 168/378
  4. Subtract the two fractions:
    45/378 - 168/378 = 45 - 168/378 = -123/378
  5. After reducing the fraction, the answer is -41/126

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