I normally do not use this blog for other items I see on the internet but I cannot help it this time. There is a blog called Kids Math Teacher that is simply amazing but what is really cool about it is the Kickstarter project she is doing.
The project is a series of recipes that kids use both in and outside the classroom to learn math. The kids pay for things just like they would on any menu at a restaurant. They learn money and all the math that goes along with it while having fun. The blog website is http://www.kidsmathteacher.com/
If you have some time check it out and keep an eye out for her new Kickstarter project.