Answers

Add 18/81 and 40/15

1^st number: 18/81, 2^nd number: 2 10/15

18/81 + 40/15 is 26/9.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 15 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 81 × 5 = 405,
   18/81 = 18 × 5/81 × 5 = 90/405
3. Likewise, for the 2nd fraction, since 15 × 27 = 405,
   40/15 = 40 × 27/15 × 27 = 1080/405
4. Add the two like fractions:
   90/405 + 1080/405 = 90 + 1080/405 = 1170/405
5. 1170/405 simplified gives 26/9
6. So, 18/81 + 40/15 = 26/9
   In mixed form: 28/9

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