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Add 12/42 and 3/21

12/42 + 3/21 is 3/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 21 is 42
  2. For the 1st fraction, since 42 × 1 = 42,
    12/42 = 12 × 1/42 × 1 = 12/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    3/21 = 3 × 2/21 × 2 = 6/42
  4. Add the two fractions:
    12/42 + 6/42 = 12 + 6/42 = 18/42
  5. After reducing the fraction, the answer is 3/7

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