Answers

Add 70/15 and 28/81

1^st number: 4 10/15, 2^nd number: 28/81

70/15 + 28/81 is 406/81.

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,
   70/15 = 70 × 27/15 × 27 = 1890/405
3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
   28/81 = 28 × 5/81 × 5 = 140/405
4. Add the two like fractions:
   1890/405 + 140/405 = 1890 + 140/405 = 2030/405
5. 2030/405 simplified gives 406/81
6. So, 70/15 + 28/81 = 406/81
   In mixed form: 51/81

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