Answers

Add 4/81 and 90/16

1^st number: 4/81, 2^nd number: 5 10/16

4/81 + 90/16 is 3677/648.

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,
   4/81 = 4 × 16/81 × 16 = 64/1296
3. Likewise, for the 2nd fraction, since 16 × 81 = 1296,
   90/16 = 90 × 81/16 × 81 = 7290/1296
4. Add the two like fractions:
   64/1296 + 7290/1296 = 64 + 7290/1296 = 7354/1296
5. 7354/1296 simplified gives 3677/648
6. So, 4/81 + 90/16 = 3677/648
   In mixed form: 5437/648

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