Xiaoqing’s house has a room with a length of 4 meters and a width of 3.5 meters. The floor is paved with square floor tiles with a side length of 50 cm. How many square tiles are needed?
小青家有一个房间的长是4米，宽是3.5米，用边长是50厘米的正方形地砖铺地，需要多少这样的方砖？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3.5 / (1/4)</gadget>
<output>14</output>

<gadget id="calculator">4 * 14</gadget>
<output>56</output>

<result>56</result>