University of South Florida
Fcat: Two for One Box Company: Teacher Notes
At this site students use proportions to explore how volume is effected by dimension changes. This hands-on activity can be done individually or in pairs.
McGraw Hill
Glencoe Online Study Tools: Volume of Cylinders
This is a great place to practice using the formula for finding the volume of a cylinder. A hint is available as well as the correct answer for each problem.