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Add 20/27 and 9/21

20/27 + 9/21 is 221/189.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 21 is 189

    Next, find the equivalent fraction of both fractional numbers with denominator 189
  2. For the 1st fraction, since 27 × 7 = 189,
    20/27 = 20 × 7/27 × 7 = 140/189
  3. Likewise, for the 2nd fraction, since 21 × 9 = 189,
    9/21 = 9 × 9/21 × 9 = 81/189
  4. Add the two like fractions:
    140/189 + 81/189 = 140 + 81/189 = 221/189
  5. So, 20/27 + 9/21 = 221/189
    In mixed form: 132/189

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