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Subtract 4/21 from 4/5

4/5 - 4/21 is 64/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105
  2. For the 1st fraction, since 5 × 21 = 105,
    4/5 = 4 × 21/5 × 21 = 84/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    4/21 = 4 × 5/21 × 5 = 20/105
  4. Subtract the two fractions:
    84/105 - 20/105 = 84 - 20/105 = 64/105

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