Lay floor tiles on the floor of a classroom. The length, width and height of the classroom are 8 meters, 5 meters and 3 meters respectively. The length, width, and height of the floor tiles are 80 centimeters, 50 centimeters, and 0.6 centimeters respectively. How many such floor tiles should be used at least?
给一间教室地面铺上地砖，教室的长、宽、高分别是8米、5米和3米．地砖的长、宽、高分别是80厘米、50厘米和0.6厘米，至少要用多少块这种地砖？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(4/5) * (1/2)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">5 / (2/5)</gadget>
<output>25/2 = around 12.5</output>

<gadget id="calculator">8 * (25/2)</gadget>
<output>100</output>

<result>100</result>