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Add 12/42 and 2/80

12/42 + 2/80 is 87/280.

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,
    2/80 = 2 × 21/80 × 21 = 42/1680
  4. Add the two fractions:
    480/1680 + 42/1680 = 480 + 42/1680 = 522/1680
  5. After reducing the fraction, the answer is 87/280

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