To find the missing number, we can set up the equation based on the given information.
Let \( x \) be the missing number. According to the problem, 10% of \( x \) equals 10:
\[ 0.1 \times x = 10 \]
Now, to solve for \( x \), divide both sides of the equation by 0.1:
\[ x = \frac{10}{0.1} \]
Calculating the right side:
\[ x = 100 \]
Thus, the missing number is \( \boxed{100} \).