Find 2 things 1. volume of 1 cube 2. volme of rectangular prism
1. volume of a cube=side^3 side=1/2 v=1/2^3=1/8 cubic units
2. volume=legnth times widht itmes height 4 2 and 1/2 1 and 1/2
for ease, convert to improper 2 and 1/2=2+1/2=4/2+1/2=5/2 1 and 1/2=1+1/2=2/2+1/2=3/2
so v=4/1 times 5/2 times 3/2=60/4=15
so
how many cubes does it take to fill the prism how many cubes times volume of 1 cube=volume of prism xcubes times 1/8unit^3=15unt^3 multiply both sides by 8/1 unit^3 to clear fraction (since 1/8 times 8/1=8/8=1) xcubes=240
Once you subtract both sides, the 4 is gone then the 10 is subtracted into a 6. You go to the 3x, and just like what you did to the 4 you do the opposite and divide the 3 by itself and the 6 by 3 as well.
