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Add 18/42 and 20/80

18/42 + 20/80 is 19/28.

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,
    18/42 = 18 × 40/42 × 40 = 720/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    20/80 = 20 × 21/80 × 21 = 420/1680
  4. Add the two fractions:
    720/1680 + 420/1680 = 720 + 420/1680 = 1140/1680
  5. 1140/1680 simplified gives 19/28
  6. So, 18/42 + 20/80 = 19/28

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