Holy cow!!! I don't know what kind of magic mojo you've got, but keep it coming--that idea worked like a dream with my DD8, who has been getting frustrated with math. I told her the idea, and she gave me this really sweet look and said, "I get it, we take it down brick by brick..." The wall has been built, we had the best math session EVER, and she proudly took a brick off her wall.

Best. Idea. Ever.