Answers

Add 28/81 and 21/98

28/81 + 21/98 is 635/1134.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 98 is 7938
   
   Next, find the equivalent fraction of both fractional numbers with denominator 7938
2. For the 1st fraction, since 81 × 98 = 7938,
   28/81 = 28 × 98/81 × 98 = 2744/7938
3. Likewise, for the 2nd fraction, since 98 × 81 = 7938,
   21/98 = 21 × 81/98 × 81 = 1701/7938
4. Add the two like fractions:
   2744/7938 + 1701/7938 = 2744 + 1701/7938 = 4445/7938
5. 4445/7938 simplified gives 635/1134
6. So, 28/81 + 21/98 = 635/1134

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