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Subtract 9/18 from 9/42

9/42 - 9/18 is -2/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    9/42 = 9 × 3/42 × 3 = 27/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    9/18 = 9 × 7/18 × 7 = 63/126
  4. Subtract the two fractions:
    27/126 - 63/126 = 27 - 63/126 = -36/126
  5. After reducing the fraction, the answer is -2/7

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