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Add 8/21 and 10/15

8/21 + 10/15 is 22/21.

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,
    8/21 = 8 × 5/21 × 5 = 40/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    10/15 = 10 × 7/15 × 7 = 70/105
  4. Add the two like fractions:
    40/105 + 70/105 = 40 + 70/105 = 110/105
  5. 110/105 simplified gives 22/21
  6. So, 8/21 + 10/15 = 22/21
    In mixed form: 11/21

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