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Subtract 2/5 from 16/21

16/21 - 2/5 is 38/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 21 × 5 = 105,
    16/21 = 16 × 5/21 × 5 = 80/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    2/5 = 2 × 21/5 × 21 = 42/105
  4. Subtract the two like fractions:
    80/105 - 42/105 = 80 - 42/105 = 38/105

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