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Add 3/15 and 6/21

3/15 + 6/21 is 17/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 15 × 7 = 105,
    3/15 = 3 × 7/15 × 7 = 21/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    6/21 = 6 × 5/21 × 5 = 30/105
  4. Add the two like fractions:
    21/105 + 30/105 = 21 + 30/105 = 51/105
  5. 51/105 simplified gives 17/35
  6. So, 3/15 + 6/21 = 17/35

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