A drawer of Mr. Wang's desk is 50cm long, 40cm wide and 12cm high. How many square decimeters of wood do you need to make this drawer?

It is equivalent to calculating the surface area of a cuboid with no cover (only five faces)
50 * 40 + 50 * 12 * 2 + 40 * 12 * 2 = 4160 square centimeter
4160 square centimeter = 41.6 square decimeter

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