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Subtract 6/12 from 3/21

3/21 - 6/12 is -5/14.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    3/21 = 3 × 4/21 × 4 = 12/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    6/12 = 6 × 7/12 × 7 = 42/84
  4. Subtract the two like fractions:
    12/84 - 42/84 = 12 - 42/84 = -30/84
  5. After reducing the fraction, the answer is -5/14

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