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Add 15/42 and 20/40

15/42 + 20/40 is 6/7.

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,
    20/40 = 20 × 21/40 × 21 = 420/840
  4. Add the two like fractions:
    300/840 + 420/840 = 300 + 420/840 = 720/840
  5. 720/840 simplified gives 6/7
  6. So, 15/42 + 20/40 = 6/7

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