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Subtract 6/21 from 5/42

5/42 - 6/21 is -1/6.

Steps for subtracting fractions

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

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

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