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Add 15/42 and 3/40

15/42 + 3/40 is 121/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 42 × 20 = 840,
    15/42 = 15 × 20/42 × 20 = 300/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    3/40 = 3 × 21/40 × 21 = 63/840
  4. Add the two like fractions:
    300/840 + 63/840 = 300 + 63/840 = 363/840
  5. 363/840 simplified gives 121/280
  6. So, 15/42 + 3/40 = 121/280

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