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Add 72/90 and 9/12

72/90 + 9/12 is 31/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 12 is 180
  2. For the 1st fraction, since 90 × 2 = 180,
    72/90 = 72 × 2/90 × 2 = 144/180
  3. Likewise, for the 2nd fraction, since 12 × 15 = 180,
    9/12 = 9 × 15/12 × 15 = 135/180
  4. Add the two fractions:
    144/180 + 135/180 = 144 + 135/180 = 279/180
  5. After reducing the fraction, the answer is 31/20
  6. In mixed form: 111/20

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