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Add 12/21 and 15/81

12/21 + 15/81 is 143/189.

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,
    12/21 = 12 × 27/21 × 27 = 324/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    15/81 = 15 × 7/81 × 7 = 105/567
  4. Add the two fractions:
    324/567 + 105/567 = 324 + 105/567 = 429/567
  5. After reducing the fraction, the answer is 143/189

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