Floor tiles are used to pave the classroom floor. If square floor tiles with an area of 0.16 square meters are used, 500 pieces are needed. If square floor tiles with a side length of 0.5m are used instead, how many pieces are needed?
用地板砖铺教室地面，若用面积为0.16㎡的正方形地砖需要500块，如果改用边长0.5m的正方形地砖，则需要多少块？
<gadget id="calculator">0.16 * 500</gadget>
<output>80</output>

<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">80 / 0.25</gadget>
<output>320</output>

<result>320</result>