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Add 15/21 and 12/45

15/21 + 12/45 is 103/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 21 × 15 = 315,
    15/21 = 15 × 15/21 × 15 = 225/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    12/45 = 12 × 7/45 × 7 = 84/315
  4. Add the two like fractions:
    225/315 + 84/315 = 225 + 84/315 = 309/315
  5. 309/315 simplified gives 103/105
  6. So, 15/21 + 12/45 = 103/105

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