To add the fractions ( \frac{11}{18} ) and ( \frac{2}{9} ) together, we need to find a common denominator. In this case, the least common multiple of 18 and 9 is 18. So, we rewrite the fractions with the common denominator:
( \frac{11}{18} + \frac{2}{9} = \frac{11 \cdot 1}{18 \cdot 1} + \frac{2 \cdot 2}{9 \cdot 2} )
( = \frac{11}{18} + \frac{4}{18} )
Now that the fractions have the same denominator, we can add the numerators:
( = \frac{11 + 4}{18} = \frac{15}{18} )
Finally, we can simplify the fraction by dividing both the numerator and denominator by the greatest common divisor, which is 3:
( \frac{15}{18} = \frac{5}{6} )
Therefore, the sum of ( \frac{11}{18} + \frac{2}{9} ) is ( \frac{5}{6} ).