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Add 5/21 and 28/15

1st number: 5/21, 2nd number: 1 13/15

5/21 + 28/15 is 221/105.

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,
    5/21 = 5 × 5/21 × 5 = 25/105
  3. Likewise, for the 2nd fraction, since 15 × 7 = 105,
    28/15 = 28 × 7/15 × 7 = 196/105
  4. Add the two like fractions:
    25/105 + 196/105 = 25 + 196/105 = 221/105
  5. So, 5/21 + 28/15 = 221/105
    In mixed form: 211/105

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