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Add 5/15 and 4/21

5/15 + 4/21 is 11/21.

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,
    5/15 = 5 × 7/15 × 7 = 35/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    4/21 = 4 × 5/21 × 5 = 20/105
  4. Add the two like fractions:
    35/105 + 20/105 = 35 + 20/105 = 55/105
  5. 55/105 simplified gives 11/21
  6. So, 5/15 + 4/21 = 11/21

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