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Add 18/42 and 40/80

18/42 + 40/80 is 13/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 80 is 1680

    Next, find the equivalent fraction of both fractional numbers with denominator 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,
    40/80 = 40 × 21/80 × 21 = 840/1680
  4. Add the two like fractions:
    720/1680 + 840/1680 = 720 + 840/1680 = 1560/1680
  5. 1560/1680 simplified gives 13/14
  6. So, 18/42 + 40/80 = 13/14

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