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Add 28/80 and 18/42

28/80 + 18/42 is 109/140.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 1680
  2. For the 1st fraction, since 80 × 21 = 1680,
    28/80 = 28 × 21/80 × 21 = 588/1680
  3. Likewise, for the 2nd fraction, since 42 × 40 = 1680,
    18/42 = 18 × 40/42 × 40 = 720/1680
  4. Add the two like fractions:
    588/1680 + 720/1680 = 588 + 720/1680 = 1308/1680
  5. 1308/1680 simplified gives 109/140
  6. So, 28/80 + 18/42 = 109/140

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