Answers

Add 28/8 and 18/81

1^st number: 3 4/8, 2^nd number: 18/81

28/8 + 18/81 is 67/18.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 8 and 81 is 648
   
   Next, find the equivalent fraction of both fractional numbers with denominator 648
2. For the 1st fraction, since 8 × 81 = 648,
   28/8 = 28 × 81/8 × 81 = 2268/648
3. Likewise, for the 2nd fraction, since 81 × 8 = 648,
   18/81 = 18 × 8/81 × 8 = 144/648
4. Add the two like fractions:
   2268/648 + 144/648 = 2268 + 144/648 = 2412/648
5. 2412/648 simplified gives 67/18
6. So, 28/8 + 18/81 = 67/18
   In mixed form: 313/18

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