Answers

Add 81/12 and 20/9

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

81/12 + 20/9 is 323/36.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 12 and 9 is 36
   
   Next, find the equivalent fraction of both fractional numbers with denominator 36
2. For the 1st fraction, since 12 × 3 = 36,
   81/12 = 81 × 3/12 × 3 = 243/36
3. Likewise, for the 2nd fraction, since 9 × 4 = 36,
   20/9 = 20 × 4/9 × 4 = 80/36
4. Add the two like fractions:
   243/36 + 80/36 = 243 + 80/36 = 323/36
5. So, 81/12 + 20/9 = 323/36
   In mixed form: 835/36

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