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Add 12/42 and 15/40

12/42 + 15/40 is 37/56.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840
  2. For the 1st fraction, since 42 × 20 = 840,
    12/42 = 12 × 20/42 × 20 = 240/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    15/40 = 15 × 21/40 × 21 = 315/840
  4. Add the two fractions:
    240/840 + 315/840 = 240 + 315/840 = 555/840
  5. 555/840 simplified gives 37/56
  6. So, 12/42 + 15/40 = 37/56

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