[jimmango]

When I go to stores and the kid cashier says $4.61, I purposely give the .11 to confuse them. Fun to watch.
Even better, last weekend I had a bill for $10.04 at a local restaurant. After giving the cashier (high school girl) $20, I said that I think I have the $0.04. I pulled out a quarter and gave it to her. After standing there for a bit, looking at the confused look on her face, I told her she needed to give me $10.21 back. Maybe I should have said $15.21?

[super7man]

Part of your homeschooling math ciriculum was to have our kids count change back to us. We did all the weird things you are talking about. They caught on pretty quickly. Then we would go shoot hoops.