The school needs to lay floor tiles in a rectangular game room with a length of 15 meters and a width of 8 meters. It is known that each floor tile is a square with a side length of 0.5 meters. What is the minimum number of these floor tiles needed to pave this game room?
学校要在一间长15米、宽8米的长方形游艺室里铺地砖，已知每块地砖是边长为0.5米的正方形．铺这间游艺室至少要用这种地砖多少块？
<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">8 / 0.25</gadget>
<output>32</output>

<gadget id="calculator">15 * 32</gadget>
<output>480</output>

<result>480</result>