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Subtract 9/12 from 18/42

18/42 - 9/12 is -9/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 42 × 2 = 84,
    18/42 = 18 × 2/42 × 2 = 36/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    9/12 = 9 × 7/12 × 7 = 63/84
  4. Subtract the two like fractions:
    36/84 - 63/84 = 36 - 63/84 = -27/84
  5. After reducing the fraction, the answer is -9/28

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