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Add 7/21 and 21/27

7/21 + 21/27 is 10/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 27 is 189
  2. For the 1st fraction, since 21 × 9 = 189,
    7/21 = 7 × 9/21 × 9 = 63/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    21/27 = 21 × 7/27 × 7 = 147/189
  4. Add the two fractions:
    63/189 + 147/189 = 63 + 147/189 = 210/189
  5. 210/189 simplified gives 10/9
  6. So, 7/21 + 21/27 = 10/9
    In mixed form: 11/9

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