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Add 12/84 and 72/90

12/84 + 72/90 is 33/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 90 is 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    12/84 = 12 × 15/84 × 15 = 180/1260
  3. Likewise, for the 2nd fraction, since 90 × 14 = 1260,
    72/90 = 72 × 14/90 × 14 = 1008/1260
  4. Add the two fractions:
    180/1260 + 1008/1260 = 180 + 1008/1260 = 1188/1260
  5. 1188/1260 simplified gives 33/35
  6. So, 12/84 + 72/90 = 33/35

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