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Add 6/21 and 10/15

6/21 + 10/15 is 20/21.

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,
    6/21 = 6 × 5/21 × 5 = 30/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    10/15 = 10 × 7/15 × 7 = 70/105
  4. Add the two like fractions:
    30/105 + 70/105 = 30 + 70/105 = 100/105
  5. 100/105 simplified gives 20/21
  6. So, 6/21 + 10/15 = 20/21

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