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Add 4/21 and 21/81

4/21 + 21/81 is 85/189.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 81 is 567
  2. For the 1st fraction, since 21 × 27 = 567,
    4/21 = 4 × 27/21 × 27 = 108/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    21/81 = 21 × 7/81 × 7 = 147/567
  4. Add the two fractions:
    108/567 + 147/567 = 108 + 147/567 = 255/567
  5. After reducing the fraction, the answer is 85/189

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