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Add 6/21 and 9/15

6/21 + 9/15 is 31/35.

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,
    6/21 = 6 × 5/21 × 5 = 30/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    9/15 = 9 × 7/15 × 7 = 63/105
  4. Add the two like fractions:
    30/105 + 63/105 = 30 + 63/105 = 93/105
  5. 93/105 simplified gives 31/35
  6. So, 6/21 + 9/15 = 31/35

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