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Add 12/42 and 15/80

12/42 + 15/80 is 53/112.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680
  2. For the 1st fraction, since 42 × 40 = 1680,
    12/42 = 12 × 40/42 × 40 = 480/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    15/80 = 15 × 21/80 × 21 = 315/1680
  4. Add the two fractions:
    480/1680 + 315/1680 = 480 + 315/1680 = 795/1680
  5. 795/1680 simplified gives 53/112
  6. So, 12/42 + 15/80 = 53/112

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