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Add 8/21 and 9/81

8/21 + 9/81 is 31/63.

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,
    8/21 = 8 × 27/21 × 27 = 216/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    9/81 = 9 × 7/81 × 7 = 63/567
  4. Add the two fractions:
    216/567 + 63/567 = 216 + 63/567 = 279/567
  5. After reducing the fraction, the answer is 31/63

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