Sally has 72 small wooden cubes each measuring 1cm x 1cm x 1cm. She arranged them all so that they form a cuboid. Given that the perimeter of the base of the cuboid is 16cm, what is it’s height?

The perimeter means "all around", so all the sides of the base equals 16 cm, which means that one side must equal 4 cm.

Since the shape is a cube, all the sides are the same, which means that the height MUST be 4 cm.   A. 4 cm is your answer