Answers

Add 81/9 and 90/18

1^st number: 9 0/9, 2^nd number: 5 0/18

81/9 + 90/18 is 14/1.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 9 and 18 is 18
   
   Next, find the equivalent fraction of both fractional numbers with denominator 18
2. For the 1st fraction, since 9 × 2 = 18,
   81/9 = 81 × 2/9 × 2 = 162/18
3. Likewise, for the 2nd fraction, since 18 × 1 = 18,
   90/18 = 90 × 1/18 × 1 = 90/18
4. Add the two like fractions:
   162/18 + 90/18 = 162 + 90/18 = 252/18
5. 252/18 simplified gives 14/1
6. So, 81/9 + 90/18 = 14/1

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