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Subtract 3/6 from 4/21

4/21 - 3/6 is -13/42.

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,
    4/21 = 4 × 2/21 × 2 = 8/42
  3. Likewise, for the 2nd fraction, since 6 × 7 = 42,
    3/6 = 3 × 7/6 × 7 = 21/42
  4. Subtract the two like fractions:
    8/42 - 21/42 = 8 - 21/42 = -13/42

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