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Add 5/21 and 8/15

5/21 + 8/15 is 27/35.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 21 × 5 = 105,
    5/21 = 5 × 5/21 × 5 = 25/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    8/15 = 8 × 7/15 × 7 = 56/105
  4. Add the two like fractions:
    25/105 + 56/105 = 25 + 56/105 = 81/105
  5. 81/105 simplified gives 27/35
  6. So, 5/21 + 8/15 = 27/35

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