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Add 1/21 and 4/5

1/21 + 4/5 is 89/105.

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,
    1/21 = 1 × 5/21 × 5 = 5/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    4/5 = 4 × 21/5 × 21 = 84/105
  4. Add the two fractions:
    5/105 + 84/105 = 5 + 84/105 = 89/105

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