How many 1-inch cubes will fit into a 3 and 1/2 in rectangular prism?

Suppose the height of the prism is 1 in, then the volume will be:

volume=length*width*height

thus

volume of the prism will be:

V=3*1/2*1

V=1.5 in³

Volume of the cube will be:

v=1*1*1=1 in³

Thus the number of cubes that will be in the prism will be:

(1.5 in³) / (1 in³)

=1.5 cubes~2 cubes