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Subtract 4/5 from 10/21

10/21 - 4/5 is -34/105.

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,
    10/21 = 10 × 5/21 × 5 = 50/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    4/5 = 4 × 21/5 × 21 = 84/105
  4. Subtract the two like fractions:
    50/105 - 84/105 = 50 - 84/105 = -34/105

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