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Add 15/42 and 21/80

15/42 + 21/80 is 347/560.

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,
    15/42 = 15 × 40/42 × 40 = 600/1680
  3. Likewise, for the 2nd fraction, since 80 × 21 = 1680,
    21/80 = 21 × 21/80 × 21 = 441/1680
  4. Add the two like fractions:
    600/1680 + 441/1680 = 600 + 441/1680 = 1041/1680
  5. 1041/1680 simplified gives 347/560
  6. So, 15/42 + 21/80 = 347/560

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