First consider the volume of the given figure
Volume =length x width x height
V=L x W x H
B=2 1/2=2.5 cm , L=2 cm , H=1 cm
V= 2.5 x 2 x 1 =5 cm3
Considering the volume of the given cube
L=H=W
For a cube the sides are the same
V = L x W x H L = 1/2 = 0.5
V= (L)3
V=(0.5)3
V=0.125 cm3
Hence number of cubes
= volume of cube / volume of fig
= 0.125/5
=0.05 cubes