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Subtract 4/6 from 6/21

6/21 - 4/6 is -8/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 6 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    6/21 = 6 × 2/21 × 2 = 12/42
  3. Likewise, for the 2nd fraction, since 6 × 7 = 42,
    4/6 = 4 × 7/6 × 7 = 28/42
  4. Subtract the two like fractions:
    12/42 - 28/42 = 12 - 28/42 = -16/42
  5. After reducing the fraction, the answer is -8/21

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