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Subtract 5/7 from 12/42

12/42 - 5/7 is -3/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 7 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 42 × 1 = 42,
    12/42 = 12 × 1/42 × 1 = 12/42
  3. Likewise, for the 2nd fraction, since 7 × 6 = 42,
    5/7 = 5 × 6/7 × 6 = 30/42
  4. Subtract the two like fractions:
    12/42 - 30/42 = 12 - 30/42 = -18/42
  5. After reducing the fraction, the answer is -3/7

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