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Add 18/21 and 4/9

18/21 + 4/9 is 82/63.

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,
    4/9 = 4 × 7/9 × 7 = 28/63
  4. Add the two fractions:
    54/63 + 28/63 = 54 + 28/63 = 82/63
  5. In mixed form: 119/63

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