Answers

Add 28/49 and 15/81

28/49 + 15/81 is 143/189.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 49 and 81 is 3969
   
   Next, find the equivalent fraction of both fractional numbers with denominator 3969
2. For the 1st fraction, since 49 × 81 = 3969,
   28/49 = 28 × 81/49 × 81 = 2268/3969
3. Likewise, for the 2nd fraction, since 81 × 49 = 3969,
   15/81 = 15 × 49/81 × 49 = 735/3969
4. Add the two like fractions:
   2268/3969 + 735/3969 = 2268 + 735/3969 = 3003/3969
5. 3003/3969 simplified gives 143/189
6. So, 28/49 + 15/81 = 143/189

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