There is a conference room in the school that is 10 meters long and 8.5 meters wide. How many square floor tiles with a side length of 5 decimeters are needed to pave the floor?
学校有一间会议室长10米，宽8.5米．用边长为5分米的正方形地砖铺地，至少需要多少块这样的地砖？
<gadget id="calculator">5 / 10</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">8.5 / (1/4)</gadget>
<output>34</output>

<gadget id="calculator">10 * 34</gadget>
<output>340</output>

<result>340</result>