The shape is a cuboid made up of cubes
The volume of a cuboid = Length x width x height
Each cube is 1cm in length, 1cm in height and 1cm in width
So for the entire shape the
Length = 8cm
width = 6cm
height =3cm
The volume therefore =
[tex]8\operatorname{cm}\times6\operatorname{cm}\times3\operatorname{cm}=144cm^3[/tex]