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Add 15/80 and 10/42

15/80 + 10/42 is 143/336.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 42 is 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,
    10/42 = 10 × 40/42 × 40 = 400/1680
  4. Add the two fractions:
    315/1680 + 400/1680 = 315 + 400/1680 = 715/1680
  5. 715/1680 simplified gives 143/336
  6. So, 15/80 + 10/42 = 143/336

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