Answers

Add 8/81 and 28/84

8/81 + 28/84 is 35/81.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 84 is 2268
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2268
2. For the 1st fraction, since 81 × 28 = 2268,
   8/81 = 8 × 28/81 × 28 = 224/2268
3. Likewise, for the 2nd fraction, since 84 × 27 = 2268,
   28/84 = 28 × 27/84 × 27 = 756/2268
4. Add the two like fractions:
   224/2268 + 756/2268 = 224 + 756/2268 = 980/2268
5. 980/2268 simplified gives 35/81
6. So, 8/81 + 28/84 = 35/81

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