There are a bunch of resources out there for teaching kids about money. I have links to a few helpful websites, which also offer great books and games, for teaching kids about money and financial responsibility on the website
http://www.campmoolah.com/shop.cfm.
The website is for Camp Moolah, a one-day camp for kids that teaches financial responsibility and how money works. If you are in the Atlanta, GA, USA area, you should check it out. Camp Moolah's fun environment teaches kids ages 11-15 real-world money skills that help them make good financial choices for life. They learn responsible behavior in selecting careers and spending and managing money. The kids love the interactivity of the day, with games and role play instead of lectures.