Question

A rectangular prism has a length of 9 in., a width of 4 in., and a height of 1 1/2 in.

The prism is filled with cubes that have edge lengths of 1/2 in.



How many cubes are needed to fill the rectangular prism?
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Answer 1

First you multiply 9*4=36 then multiply 36*3/2=108/2

Then multiply 1/2 * 1/2 *1/2 =1/8

Lastly divide 108/2  and 1/8 
which is 108/2*8/1 =864/2=432
So the answer is 432. Hope this helps