Answers

Add 40/49 and 42/81

40/49 + 42/81 is 1766/1323.

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,
   40/49 = 40 × 81/49 × 81 = 3240/3969
3. Likewise, for the 2nd fraction, since 81 × 49 = 3969,
   42/81 = 42 × 49/81 × 49 = 2058/3969
4. Add the two like fractions:
   3240/3969 + 2058/3969 = 3240 + 2058/3969 = 5298/3969
5. 5298/3969 simplified gives 1766/1323
6. So, 40/49 + 42/81 = 1766/1323
   In mixed form: 1443/1323

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