To pave a room with a length of 6 meters and a width of 4 meters, at least how many small floor tiles with a side length of 4 decimeters are needed.
要铺一间长6米，宽4米的房间，至少需要边长4分米的小地砖多少块．
<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">4 * 10</gadget>
<output>40</output>

<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">40 / 16</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">60 * (5/2)</gadget>
<output>150</output>

<result>150</result>