Originally Posted by frannieandejsmom
I am wondering if there are any math reading books on this level as this is truly where his interest is. He told me yesterday, he wants to learn about the united america states over the summer (USA maps). So now I have been challenged to find inexpensive materials.

Have you tried the sir Cumference books, DS 5 loved them.
Sir Cumference

I found that on the list of books thread there are a couple of good threads on mathy books, with penrose the cat and some others

DeHe