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Add 28/21 and 84/15

1st number: 1 7/21, 2nd number: 5 9/15

28/21 + 84/15 is 104/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 15 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    28/21 = 28 × 5/21 × 5 = 140/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    84/15 = 84 × 7/15 × 7 = 588/105
  4. Add the two fractions:
    140/105 + 588/105 = 140 + 588/105 = 728/105
  5. After reducing the fraction, the answer is 104/15
  6. In mixed form: 614/15

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