Answers

Add 90/75 and 81/16

1^st number: 1 15/75, 2^nd number: 5 1/16

90/75 + 81/16 is 501/80.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 75 and 16 is 1200
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1200
2. For the 1st fraction, since 75 × 16 = 1200,
   90/75 = 90 × 16/75 × 16 = 1440/1200
3. Likewise, for the 2nd fraction, since 16 × 75 = 1200,
   81/16 = 81 × 75/16 × 75 = 6075/1200
4. Add the two like fractions:
   1440/1200 + 6075/1200 = 1440 + 6075/1200 = 7515/1200
5. 7515/1200 simplified gives 501/80
6. So, 90/75 + 81/16 = 501/80
   In mixed form: 621/80

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