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Add 15/36 and 20/21

15/36 + 20/21 is 115/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 36 and 21 is 252

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 36 × 7 = 252,
    15/36 = 15 × 7/36 × 7 = 105/252
  3. Likewise, for the 2nd fraction, since 21 × 12 = 252,
    20/21 = 20 × 12/21 × 12 = 240/252
  4. Add the two like fractions:
    105/252 + 240/252 = 105 + 240/252 = 345/252
  5. 345/252 simplified gives 115/84
  6. So, 15/36 + 20/21 = 115/84
    In mixed form: 131/84

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