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Add 72/9 and 21/12

1st number: 8 0/9, 2nd number: 1 9/12

72/9 + 21/12 is 39/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 12 is 36
  2. For the 1st fraction, since 9 × 4 = 36,
    72/9 = 72 × 4/9 × 4 = 288/36
  3. Likewise, for the 2nd fraction, since 12 × 3 = 36,
    21/12 = 21 × 3/12 × 3 = 63/36
  4. Add the two fractions:
    288/36 + 63/36 = 288 + 63/36 = 351/36
  5. After reducing the fraction, the answer is 39/4
  6. In mixed form: 93/4

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