The network classroom is 9.5 meters long and 7.5 meters wide, and the floor is paved with tiles with a side length of 0.5 meters. How many tiles are needed?
网络教室长是9.5米，宽是7.5米，用边长0.5米的瓷砖铺地，共需要这种瓷砖多少块？
<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">7.5 / 0.25</gadget>
<output>30</output>

<gadget id="calculator">9.5 * 30</gadget>
<output>285</output>

<result>285</result>