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Subtract 6/8 from 9/42

9/42 - 6/8 is -15/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 8 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 42 × 4 = 168,
    9/42 = 9 × 4/42 × 4 = 36/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    6/8 = 6 × 21/8 × 21 = 126/168
  4. Subtract the two like fractions:
    36/168 - 126/168 = 36 - 126/168 = -90/168
  5. After reducing the fraction, the answer is -15/28

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