Answers

Add 90/81 and 45/16

1^st number: 1 9/81, 2^nd number: 2 13/16

90/81 + 45/16 is 565/144.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 16 is 1296
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1296
2. For the 1st fraction, since 81 × 16 = 1296,
   90/81 = 90 × 16/81 × 16 = 1440/1296
3. Likewise, for the 2nd fraction, since 16 × 81 = 1296,
   45/16 = 45 × 81/16 × 81 = 3645/1296
4. Add the two like fractions:
   1440/1296 + 3645/1296 = 1440 + 3645/1296 = 5085/1296
5. 5085/1296 simplified gives 565/144
6. So, 90/81 + 45/16 = 565/144
   In mixed form: 3133/144

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