Xiao Ming's room is 4.5m long, 3.5m wide, and 2.8m high. To pave this room with a 4cm thick solid wood floor, how many square meters of wood do you need at least? (1 square = 1 cubic meter)
小明的房间长4.5m，宽3.5m，高2.8m．给这个房间铺上4cm厚的实木地板，至少需要用去多少方的木材？(1方=1立方米)
<gadget id="calculator">4 / 100</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">4.5 * 3.5 * (1/25)</gadget>
<output>0.63</output>

<result>0.63</result>