Answers

Add 21/49 and 20/81

21/49 + 20/81 is 383/567.

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,
   21/49 = 21 × 81/49 × 81 = 1701/3969
3. Likewise, for the 2nd fraction, since 81 × 49 = 3969,
   20/81 = 20 × 49/81 × 49 = 980/3969
4. Add the two like fractions:
   1701/3969 + 980/3969 = 1701 + 980/3969 = 2681/3969
5. 2681/3969 simplified gives 383/567
6. So, 21/49 + 20/81 = 383/567

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