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Add 16/21 and 21/81

16/21 + 21/81 is 193/189.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 81 is 567

    Next, find the equivalent fraction of both fractional numbers with denominator 567
  2. For the 1st fraction, since 21 × 27 = 567,
    16/21 = 16 × 27/21 × 27 = 432/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    21/81 = 21 × 7/81 × 7 = 147/567
  4. Add the two like fractions:
    432/567 + 147/567 = 432 + 147/567 = 579/567
  5. 579/567 simplified gives 193/189
  6. So, 16/21 + 21/81 = 193/189
    In mixed form: 14/189

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