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Subtract 35/56 from 12/42

12/42 - 35/56 is -19/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 56 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 42 × 4 = 168,
    12/42 = 12 × 4/42 × 4 = 48/168
  3. Likewise, for the 2nd fraction, since 56 × 3 = 168,
    35/56 = 35 × 3/56 × 3 = 105/168
  4. Subtract the two like fractions:
    48/168 - 105/168 = 48 - 105/168 = -57/168
  5. After reducing the fraction, the answer is -19/56

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