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a page in Flash for practice with place value

"To play Ghost Blasters select a multiple of which each "bad" ghost will have a value that is a multiple of that which you chose. Students then use their mouse to blast every "bad" ghost. For example, if I select "5″ at the beginning then all bad ghosts will display a multiple of 5. I then have to blast all of the bad ghosts to gain points, but if I blast a "good" ghost (a ghost that does not have a multiple of 5) I lose points." (description from http://tiny.cc/x9UpE)

carefully sorted list of interactive websites

Virtual Base to blocks