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Add 3/15 and 10/21

3/15 + 10/21 is 71/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 21 is 105
  2. For the 1st fraction, since 15 × 7 = 105,
    3/15 = 3 × 7/15 × 7 = 21/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    10/21 = 10 × 5/21 × 5 = 50/105
  4. Add the two fractions:
    21/105 + 50/105 = 21 + 50/105 = 71/105

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