Answers

Add 84/12 and 72/81

1^st number: 7 0/12, 2^nd number: 72/81

84/12 + 72/81 is 71/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 81 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 12 × 27 = 324,
   84/12 = 84 × 27/12 × 27 = 2268/324
3. Likewise, for the 2nd fraction, since 81 × 4 = 324,
   72/81 = 72 × 4/81 × 4 = 288/324
4. Add the two like fractions:
   2268/324 + 288/324 = 2268 + 288/324 = 2556/324
5. 2556/324 simplified gives 71/9
6. So, 84/12 + 72/81 = 71/9
   In mixed form: 78/9

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