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Add 12/18 and 3/21

12/18 + 3/21 is 17/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 18 and 21 is 126
  2. For the 1st fraction, since 18 × 7 = 126,
    12/18 = 12 × 7/18 × 7 = 84/126
  3. Likewise, for the 2nd fraction, since 21 × 6 = 126,
    3/21 = 3 × 6/21 × 6 = 18/126
  4. Add the two fractions:
    84/126 + 18/126 = 84 + 18/126 = 102/126
  5. After reducing the fraction, the answer is 17/21

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