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Add 5/21 and 4/5

5/21 + 4/5 is 109/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    5/21 = 5 × 5/21 × 5 = 25/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    4/5 = 4 × 21/5 × 21 = 84/105
  4. Add the two fractions:
    25/105 + 84/105 = 25 + 84/105 = 109/105
  5. In mixed form: 14/105

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