To find the missing number that makes the fractions equal, we have the equation:
\(\frac{?}{2} = \frac{9}{18}\)
First, we simplify \(\frac{9}{18}\):
\(\frac{9}{18} = \frac{1}{2}\)
Now we set the equation:
\(\frac{?}{2} = \frac{1}{2}\)
Since both fractions have the same denominator, we can equate the numerators:
? = 1
So the missing number is 1.