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Add 28/30 and 21/81

28/30 + 21/81 is 161/135.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 81 is 810

    Next, find the equivalent fraction of both fractional numbers with denominator 810
  2. For the 1st fraction, since 30 × 27 = 810,
    28/30 = 28 × 27/30 × 27 = 756/810
  3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
    21/81 = 21 × 10/81 × 10 = 210/810
  4. Add the two like fractions:
    756/810 + 210/810 = 756 + 210/810 = 966/810
  5. 966/810 simplified gives 161/135
  6. So, 28/30 + 21/81 = 161/135
    In mixed form: 126/135

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