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Add 12/21 and 9/12

12/21 + 9/12 is 37/28.

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,
    12/21 = 12 × 4/21 × 4 = 48/84
  3. Likewise, for the 2nd fraction, since 12 × 7 = 84,
    9/12 = 9 × 7/12 × 7 = 63/84
  4. Add the two fractions:
    48/84 + 63/84 = 48 + 63/84 = 111/84
  5. After reducing the fraction, the answer is 37/28
  6. In mixed form: 19/28

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