Math problem Fangfang is going to make a matchbox. On the square paper below, she designed two parts of the matchbox: the inside, the outside and the outside.
Volume: 3×4× 1= 12cm?
At least cardboard is required: 6×5-4+4×8=58cm?
Or: 3×4+(3+4)× 1×2+4×8=58cm?