A room is 4 meters long, 3.2 meters wide, and 3 meters high, and the floor is paved with square bricks with a side length of 0.4 meters. Do the math, at least how many square bricks were used in the decoration.
某房间长4米，宽3.2米，高3米，地面铺的是边长为0.4米的方砖．算一算，装修时至少用了多少块方砖．
<gadget id="calculator">0.4 * 0.4</gadget>
<output>0.16</output>

<gadget id="calculator">3.2 / 0.16</gadget>
<output>20</output>

<gadget id="calculator">4 * 20</gadget>
<output>80</output>

<result>80</result>