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Add 28/21 and 12/15

1st number: 1 7/21, 2nd number: 12/15

28/21 + 12/15 is 32/15.

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,
    12/15 = 12 × 7/15 × 7 = 84/105
  4. Add the two fractions:
    140/105 + 84/105 = 140 + 84/105 = 224/105
  5. 224/105 simplified gives 32/15
  6. So, 28/21 + 12/15 = 32/15
    In mixed form: 22/15

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