how many cubes of side 2 cm can be packed in a cubical box with inner side equal to 4 cm?

Side of the cube = 2 cm
Volume of the cube = 2 x 2 x 2 = 8 cu cm.

Side of the box = 4 cm
Volume of the box = 4 x 4 x 4 = 64 cu cm.

Number of cubes that can be packed in the box
= volume of the box / volume of the cube

= 64 / 8

= 8.