4. (3 points) Using the digits $0, 1, 2, 3, 4$, we can form $\qquad$ different three-digit numbers.
4. (3 points) Using the digits $0, 1, 2, 3, 4$, we can form $\qquad$ different three-digit numbers.

【Solution】Solution: $4 \times 4 \times 3$,
$$
\begin{array}{l}
=16 \times 3, \\
=48 \text { (types); }
\end{array}
$$

Answer: These five digits can form 48 different three-digit numbers.
Therefore, the answer is: 48.