Answers

Add 54/81 and 81/12

1^st number: 54/81, 2^nd number: 6 9/12

54/81 + 81/12 is 89/12.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 12 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 81 × 4 = 324,
   54/81 = 54 × 4/81 × 4 = 216/324
3. Likewise, for the 2nd fraction, since 12 × 27 = 324,
   81/12 = 81 × 27/12 × 27 = 2187/324
4. Add the two like fractions:
   216/324 + 2187/324 = 216 + 2187/324 = 2403/324
5. 2403/324 simplified gives 89/12
6. So, 54/81 + 81/12 = 89/12
   In mixed form: 75/12

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