The area of a classroom is 52.5 square meters, and the floor is paved with square tiles with a side length of 0.5 meters. How many such tiles are needed in total?
一间教室的面积是52.5平方米，用边长0.5米的正方形瓷砖铺地，共需要多少块这样的瓷砖？
<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">52.5 / 0.25</gadget>
<output>210</output>

<result>210</result>