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Add 72/90 and 9/84

72/90 + 9/84 is 127/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 84 is 1260
  2. For the 1st fraction, since 90 × 14 = 1260,
    72/90 = 72 × 14/90 × 14 = 1008/1260
  3. Likewise, for the 2nd fraction, since 84 × 15 = 1260,
    9/84 = 9 × 15/84 × 15 = 135/1260
  4. Add the two fractions:
    1008/1260 + 135/1260 = 1008 + 135/1260 = 1143/1260
  5. After reducing the fraction, the answer is 127/140

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