Answers

Add 42/15 and 42/81

1^st number: 2 12/15, 2^nd number: 42/81

42/15 + 42/81 is 448/135.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 15 and 81 is 405
   
   Next, find the equivalent fraction of both fractional numbers with denominator 405
2. For the 1st fraction, since 15 × 27 = 405,
   42/15 = 42 × 27/15 × 27 = 1134/405
3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
   42/81 = 42 × 5/81 × 5 = 210/405
4. Add the two like fractions:
   1134/405 + 210/405 = 1134 + 210/405 = 1344/405
5. 1344/405 simplified gives 448/135
6. So, 42/15 + 42/81 = 448/135
   In mixed form: 343/135

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