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Subtract 20/21 from 10/16

10/16 - 20/21 is -55/168.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 16 and 21 is 336

    Next, find the equivalent fraction of both fractional numbers with denominator 336
  2. For the 1st fraction, since 16 × 21 = 336,
    10/16 = 10 × 21/16 × 21 = 210/336
  3. Likewise, for the 2nd fraction, since 21 × 16 = 336,
    20/21 = 20 × 16/21 × 16 = 320/336
  4. Subtract the two like fractions:
    210/336 - 320/336 = 210 - 320/336 = -110/336
  5. After reducing the fraction, the answer is -55/168

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