Lay floor tiles for 4 classrooms, the floor tiles are squares with side length 50 cm. The floor of the classroom is 6 meters long and 4 meters wide. How many floor tiles are needed to cover these classrooms?
为4个教室铺地砖，地砖是边长为50厘米的正方形．教室地面的长为6米，宽4米，铺满这几个教室一共需要多少地砖？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 / (1/4)</gadget>
<output>16</output>

<gadget id="calculator">6 * 4 * 16</gadget>
<output>384</output>

<result>384</result>