Volume of wooden block with sides cut out

Question

A wooden block is a cube with side length 45 cm.  If a cube of side length 5 cm is cut from each of the blocks corners, what is the volume of the wooden block left?

Answer 1

original volume - removed volume =new volume

l x w x h          -  8 corners ( l x w x h)

(45cm)^3        -     8 (5cm)^3      =    90125 (cm^3)