Answers

Add 3/84 and 21/81

3/84 + 21/81 is 223/756.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 84 and 81 is 2268
   
   Next, find the equivalent fraction of both fractional numbers with denominator 2268
2. For the 1st fraction, since 84 × 27 = 2268,
   3/84 = 3 × 27/84 × 27 = 81/2268
3. Likewise, for the 2nd fraction, since 81 × 28 = 2268,
   21/81 = 21 × 28/81 × 28 = 588/2268
4. Add the two like fractions:
   81/2268 + 588/2268 = 81 + 588/2268 = 669/2268
5. 669/2268 simplified gives 223/756
6. So, 3/84 + 21/81 = 223/756

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