Use cardboard to make a cuboid box with a length of 1.2 meters, a width of 20 decimeters, and a height of 60 centimeters without a cover to store the mineral water bottles collected by the students. At least how many square decimeters of cardboard should be used?
用纸板做一个长1.2米、宽20分米、高60厘米无盖的长方体箱子用来堆放同学们收集的矿泉水瓶．至少要用多少平方分米的纸板？
<gadget id="calculator">1.2 * 10</gadget>
<output>12</output>

<gadget id="calculator">12 * 20</gadget>
<output>240</output>

<gadget id="calculator">60 / 10</gadget>
<output>6</output>

<gadget id="calculator">12 * 6 * 2</gadget>
<output>144</output>

<gadget id="calculator">20 * 6 * 2</gadget>
<output>240</output>

<gadget id="calculator">240 + 144 + 240</gadget>
<output>624</output>

<result>624</result>