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Subtract 9/21 from 5/6

5/6 - 9/21 is 17/42.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 6 × 7 = 42,
    5/6 = 5 × 7/6 × 7 = 35/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    9/21 = 9 × 2/21 × 2 = 18/42
  4. Subtract the two like fractions:
    35/42 - 18/42 = 35 - 18/42 = 17/42

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