Use 2 cm thick wooden board to make a wooden box without cover, which is 100 cm long, 65 cm wide and 85 cm high. Calculate the volume of the wooden box. (accurate to cubic decimeter)

Internal length = 100-2 × 2 = 96cm = 9.6dm
Internal width = 65-2 × 2 = 61cm = 6.1dm
Internal height = 85-2 × 2 = 81cm = 8.1dm
volume
=9.6×6.1×8.1
=474.336 cubic decimeter
About 474 cubic decimeters

To make a cuboid wooden box without cover, which is 10dm in length and 5DM in width and 5DM in height, how many cubic decimeters of boards with thickness of 1cm are needed, and how many cubic decimeters are the volume of the wooden box?

It can be seen from the stem that the requirement of your question is not high. The thickness of 1cm board can be ignored when making the box
So the 1cm board is the surface area of the box multiplied by the thickness
That is, 10 * 10 + 10 * 5 * 4 (one bottom, four sides) = 300dm ^ 2
Multiply the thickness of the small board by the required 1cm board volume: 300dm ^ 2 * 0.1dm = 30dm ^ 3
Volume is the volume of wooden box 10 * 10 * 5 = 500DM ^ 3
Of course, if you have a high demand for yourself, you can extend it, that is, don't ignore the thickness of the small board
At this time, the length and width of the bottom should be reduced by 2cm
The volume is the internal volume, and the height should be reduced by 1cm

A cuboid wooden box, the volume is 324 cubic decimeters, its width and height are 6 decimeters. How many square decimeters is the bottom area of this cuboid wooden box?

324 (6 × 6), = 324 (36), = 9 (decimeter); 9 × 6 = 54 (square decimeter); answer: the bottom area of this box is 54 square decimeter

Use 2 cm thick wooden board to make a wooden box without cover, which is 100 cm long, 65 cm wide and 85 cm high. Calculate the volume of the wooden box. (accurate to cubic decimeter)