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Add 18/21 and 6/9

18/21 + 6/9 is 32/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    18/21 = 18 × 3/21 × 3 = 54/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    6/9 = 6 × 7/9 × 7 = 42/63
  4. Add the two fractions:
    54/63 + 42/63 = 54 + 42/63 = 96/63
  5. After reducing the fraction, the answer is 32/21
  6. In mixed form: 111/21

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