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Add 12/15 and 4/84

12/15 + 4/84 is 89/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 84 is 420
  2. For the 1st fraction, since 15 × 28 = 420,
    12/15 = 12 × 28/15 × 28 = 336/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    4/84 = 4 × 5/84 × 5 = 20/420
  4. Add the two fractions:
    336/420 + 20/420 = 336 + 20/420 = 356/420
  5. After reducing the fraction, the answer is 89/105

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