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Add 18/36 and 15/42

18/36 + 15/42 is 6/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 42 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 36 × 7 = 252,
    18/36 = 18 × 7/36 × 7 = 126/252
  3. Likewise, for the 2nd fraction, since 42 × 6 = 252,
    15/42 = 15 × 6/42 × 6 = 90/252
  4. Add the two like fractions:
    126/252 + 90/252 = 126 + 90/252 = 216/252
  5. 216/252 simplified gives 6/7
  6. So, 18/36 + 15/42 = 6/7

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