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Add 16/21 and 3/12

16/21 + 3/12 is 85/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 12 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    16/21 = 16 × 4/21 × 4 = 64/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    3/12 = 3 × 7/12 × 7 = 21/84
  4. Add the two fractions:
    64/84 + 21/84 = 64 + 21/84 = 85/84
  5. In mixed form: 11/84

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