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Add 18/80 and 25/42

18/80 + 25/42 is 689/840.

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,
    18/80 = 18 × 21/80 × 21 = 378/1680
  3. Likewise, for the 2nd fraction, since 42 × 40 = 1680,
    25/42 = 25 × 40/42 × 40 = 1000/1680
  4. Add the two like fractions:
    378/1680 + 1000/1680 = 378 + 1000/1680 = 1378/1680
  5. 1378/1680 simplified gives 689/840
  6. So, 18/80 + 25/42 = 689/840

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