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Add 20/21 and 21/27

20/21 + 21/27 is 109/63.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 189
  2. For the 1st fraction, since 21 × 9 = 189,
    20/21 = 20 × 9/21 × 9 = 180/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    21/27 = 21 × 7/27 × 7 = 147/189
  4. Add the two like fractions:
    180/189 + 147/189 = 180 + 147/189 = 327/189
  5. 327/189 simplified gives 109/63
  6. So, 20/21 + 21/27 = 109/63
    In mixed form: 146/63

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