To find the missing number \( x \) in the equation:
\[ x \times 0.01 = 0.18 \]
We can isolate \( x \) by dividing both sides of the equation by 0.01:
\[ x = \frac{0.18}{0.01} \]
Now, calculate the right side:
\[ x = 0.18 \div 0.01 = 18 \]
Therefore, the missing number is
\[ \boxed{18} \]