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Add 21/27 and 28/63

21/27 + 28/63 is 11/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 63 is 189

    Next, find the equivalent fraction of both fractional numbers with denominator 189
  2. For the 1st fraction, since 27 × 7 = 189,
    21/27 = 21 × 7/27 × 7 = 147/189
  3. Likewise, for the 2nd fraction, since 63 × 3 = 189,
    28/63 = 28 × 3/63 × 3 = 84/189
  4. Add the two like fractions:
    147/189 + 84/189 = 147 + 84/189 = 231/189
  5. 231/189 simplified gives 11/9
  6. So, 21/27 + 28/63 = 11/9
    In mixed form: 12/9

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