Answers

Add 90/81 and 45/12

1^st number: 1 9/81, 2^nd number: 3 9/12

90/81 + 45/12 is 175/36.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 12 is 324
   
   Next, find the equivalent fraction of both fractional numbers with denominator 324
2. For the 1st fraction, since 81 × 4 = 324,
   90/81 = 90 × 4/81 × 4 = 360/324
3. Likewise, for the 2nd fraction, since 12 × 27 = 324,
   45/12 = 45 × 27/12 × 27 = 1215/324
4. Add the two like fractions:
   360/324 + 1215/324 = 360 + 1215/324 = 1575/324
5. 1575/324 simplified gives 175/36
6. So, 90/81 + 45/12 = 175/36
   In mixed form: 431/36

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