To make a cuboid carton without a cover, the length is 10dm, the width is 8dm, and the height is 5dm, at least how many square decimeters of cardboard are needed.
做一个无盖的长方体纸盒，长10dm，宽8dm，高5dm，至少要多少平方分米的纸板．
<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">50 + 40</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">180 + 80</gadget>
<output>260</output>

<result>260</result>