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Add 4/21 and 15/36

4/21 + 15/36 is 17/28.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 252
  2. For the 1st fraction, since 21 × 12 = 252,
    4/21 = 4 × 12/21 × 12 = 48/252
  3. Likewise, for the 2nd fraction, since 36 × 7 = 252,
    15/36 = 15 × 7/36 × 7 = 105/252
  4. Add the two like fractions:
    48/252 + 105/252 = 48 + 105/252 = 153/252
  5. 153/252 simplified gives 17/28
  6. So, 4/21 + 15/36 = 17/28

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