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Add 15/80 and 20/42

15/80 + 20/42 is 223/336.

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,
    15/80 = 15 × 21/80 × 21 = 315/1680
  3. Likewise, for the 2nd fraction, since 42 × 40 = 1680,
    20/42 = 20 × 40/42 × 40 = 800/1680
  4. Add the two like fractions:
    315/1680 + 800/1680 = 315 + 800/1680 = 1115/1680
  5. 1115/1680 simplified gives 223/336
  6. So, 15/80 + 20/42 = 223/336

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