Answers

Add 90/15 and 84/81

1^st number: 6 0/15, 2^nd number: 1 3/81

90/15 + 84/81 is 190/27.

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,
   90/15 = 90 × 27/15 × 27 = 2430/405
3. Likewise, for the 2nd fraction, since 81 × 5 = 405,
   84/81 = 84 × 5/81 × 5 = 420/405
4. Add the two like fractions:
   2430/405 + 420/405 = 2430 + 420/405 = 2850/405
5. 2850/405 simplified gives 190/27
6. So, 90/15 + 84/81 = 190/27
   In mixed form: 71/27

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