A classroom is 8.5 meters long and 6.5 meters wide, and the floor is paved with square tiles with a side length of 0.5 meters. How many tiles are needed in total?
一间教室长8.5米，宽6.5米，用边长是0.5米的正方形瓷砖铺地，共需多少块？
<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">8.5 * 26</gadget>
<output>221</output>

<result>221</result>