A room with a length of 8 meters and a width of 5 meters is paved with square floor tiles with a side length of 5dm. How many floor tiles are needed to cover them all?
一个长8米宽5米的房间铺上边长为5dm的正方形地砖，全部铺满一共需要多少块地砖？
<gadget id="calculator">5 / 10</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">5 / (1/4)</gadget>
<output>20</output>

<gadget id="calculator">8 * 20</gadget>
<output>160</output>

<result>160</result>