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Add 12/42 and 45/81

12/42 + 45/81 is 53/63.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 81 is 1134
  2. For the 1st fraction, since 42 × 27 = 1134,
    12/42 = 12 × 27/42 × 27 = 324/1134
  3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
    45/81 = 45 × 14/81 × 14 = 630/1134
  4. Add the two fractions:
    324/1134 + 630/1134 = 324 + 630/1134 = 954/1134
  5. After reducing the fraction, the answer is 53/63

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