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Subtract 1/21 from 1/2

1/2 - 1/21 is 19/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 2 and 21 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 2 × 21 = 42,
    1/2 = 1 × 21/2 × 21 = 21/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    1/21 = 1 × 2/21 × 2 = 2/42
  4. Subtract the two like fractions:
    21/42 - 2/42 = 21 - 2/42 = 19/42

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