cuboid carton is 20 cm long, 12 cm wide, and 10 cm high. How many square centimeters of cardboard should be used to make this carton?
一个长方体纸盒，长20厘米，宽12厘米，高10厘米，做这个纸盒至少用多少平方厘米的硬纸板？
<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<gadget id="calculator">12 * 10</gadget>
<output>120</output>

<gadget id="calculator">240 + 200 + 120</gadget>
<output>560</output>

<gadget id="calculator">560 * 2</gadget>
<output>1_120</output>

<result>1_120</result>