So with the link I posted earlier (see here http://ladybuganddragonflydreams.blogspot.com/2014/06/lessons-on-money.html ) We also are using this..
Other idea's is letting the kids open up savings accounts and keep track of what they put in, what they take out etc. and setting a budget. See what they are wanting to purchase and let them figure out what they have and what they would need to make the purchase. Lots of ways to incorporate both math and economics into your daily life to help them understand how money, savings, budgeting etc. all work.