Use 240 cm iron wire to make a largest cube frame, and then use cardboard to make 6 pieces of bread. At least how many square centimeters of cardboard? What is the volume of the carton in cubic centimeter?

240 △ 12 = 20 (CM); 20 × 20 × 6 = 2400 (cm 2); 20 × 20 × 20 = 8000 (cm 3); answer: at least 2400 cm 2 of cardboard is used, and the volume of carton is 8000 cm 3

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