Xiaolan's house is being renovated. Her house has a hall with a length of 8 meters and a width of 5 meters. If the hall is paved with square bricks with a side length of 5 decimeters, how many square bricks are needed?
小兰家正在装修，她家有一间长8米，宽5米的大厅，这个大厅如果用边长5分米的方砖铺地，需要方砖多少块？
<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">5 / (1/4)</gadget>
<output>20</output>

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

<result>160</result>