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Subtract 9/42 from 9/84

9/84 - 9/42 is -3/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 42 is 84
  2. For the 1st fraction, since 84 × 1 = 84,
    9/84 = 9 × 1/84 × 1 = 9/84
  3. Likewise, for the 2nd fraction, since 42 × 2 = 84,
    9/42 = 9 × 2/42 × 2 = 18/84
  4. Subtract the two fractions:
    9/84 - 18/84 = 9 - 18/84 = -9/84
  5. After reducing the fraction, the answer is -3/28

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