The living room of Uncle Wang’s house is a rectangle with a length of 5 meters and a width of 40 decimeters. If floor tiles with a side length of 5 decimeters are laid on the floor of the living room, how many pieces are needed?
王叔叔家的客厅是一个长5米，宽40分米的长方形，如果在客厅的地面上铺上边长是5分米的地砖，需要多少块？
<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">40 / 10 / (1/4)</gadget>
<output>16</output>

<gadget id="calculator">5 * 16</gadget>
<output>80</output>

<result>80</result>