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Add 36/42 and 15/21

36/42 + 15/21 is 11/7.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 21 is 42

    Next, find the equivalent fraction of both fractional numbers with denominator 42
  2. For the 1st fraction, since 42 × 1 = 42,
    36/42 = 36 × 1/42 × 1 = 36/42
  3. Likewise, for the 2nd fraction, since 21 × 2 = 42,
    15/21 = 15 × 2/21 × 2 = 30/42
  4. Add the two like fractions:
    36/42 + 30/42 = 36 + 30/42 = 66/42
  5. 66/42 simplified gives 11/7
  6. So, 36/42 + 15/21 = 11/7
    In mixed form: 14/7

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