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Add 12/15 and 42/63

12/15 + 42/63 is 22/15.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 63 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 15 × 21 = 315,
    12/15 = 12 × 21/15 × 21 = 252/315
  3. Likewise, for the 2nd fraction, since 63 × 5 = 315,
    42/63 = 42 × 5/63 × 5 = 210/315
  4. Add the two like fractions:
    252/315 + 210/315 = 252 + 210/315 = 462/315
  5. 462/315 simplified gives 22/15
  6. So, 12/15 + 42/63 = 22/15
    In mixed form: 17/15

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