Answers

Add 90/81 and 2/5

1^st number: 1 9/81, 2^nd number: 2/5

90/81 + 2/5 is 68/45.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 5 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 81 × 5 = 405,
   90/81 = 90 × 5/81 × 5 = 450/405
3. Likewise, for the 2nd fraction, since 5 × 81 = 405,
   2/5 = 2 × 81/5 × 81 = 162/405
4. Add the two like fractions:
   450/405 + 162/405 = 450 + 162/405 = 612/405
5. 612/405 simplified gives 68/45
6. So, 90/81 + 2/5 = 68/45
   In mixed form: 123/45

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