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Add 20/21 and 21/81

20/21 + 21/81 is 229/189.

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,
    20/21 = 20 × 27/21 × 27 = 540/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    21/81 = 21 × 7/81 × 7 = 147/567
  4. Add the two like fractions:
    540/567 + 147/567 = 540 + 147/567 = 687/567
  5. 687/567 simplified gives 229/189
  6. So, 20/21 + 21/81 = 229/189
    In mixed form: 140/189

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