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Add 12/84 and 42/80

12/84 + 42/80 is 187/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 80 is 1680
  2. For the 1st fraction, since 84 × 20 = 1680,
    12/84 = 12 × 20/84 × 20 = 240/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    42/80 = 42 × 21/80 × 21 = 882/1680
  4. Add the two fractions:
    240/1680 + 882/1680 = 240 + 882/1680 = 1122/1680
  5. 1122/1680 simplified gives 187/280
  6. So, 12/84 + 42/80 = 187/280

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