Gerardo says that a cube with edges that measure 6 centimeters has a volume that is twice as much as a cube with sides that measure 3 centimeters. Complete the explanation and correction for Gerardo's error.

A cube with sides of 3 cm holds 3 layers of 9 cm cubes, which is
cu cm.

A cube with sides of 6 cm could hold 6 layers of 36 cm cubes, which is
cu cm.

Although 6 is twice as much as 3, a cube has

, so each dimension is

as great.