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Subtract 3/14 from 20/21

20/21 - 3/14 is 31/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 14 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 21 × 2 = 42,
    20/21 = 20 × 2/21 × 2 = 40/42
  3. Likewise, for the 2nd fraction, since 14 × 3 = 42,
    3/14 = 3 × 3/14 × 3 = 9/42
  4. Subtract the two like fractions:
    40/42 - 9/42 = 40 - 9/42 = 31/42

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