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Add 12/21 and 3/84

12/21 + 3/84 is 17/28.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 84 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    12/21 = 12 × 4/21 × 4 = 48/84
  3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
    3/84 = 3 × 1/84 × 1 = 3/84
  4. Add the two fractions:
    48/84 + 3/84 = 48 + 3/84 = 51/84
  5. After reducing the fraction, the answer is 17/28

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