The length of the online classroom is 9.5 meters, the width is 6.5 meters, and the floor is paved with tiles with a side length of 0.5 meters. How many tiles are needed at least?
网络教室的长是9.5米，宽是6.5米，用边长0.5米的瓷砖铺地，至少需要这种瓷砖多少块？
<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">6.5 / 0.25</gadget>
<output>26</output>

<gadget id="calculator">9.5 * 26</gadget>
<output>247</output>

<result>247</result>