I have put my book, Modern Math for Elementary Schoolers, on the Internet. The book is based on my teaching experience at LAMC, Los Angeles Math Circle, a free Sunday school for mathematically inclined children, currently second grade through high school, run by the UCLA Math Dept. I had taught my own son and a few of his buddies using the material that later became that book from the first day of their kindergarten. You can find the book at the following URL.
http://www.naturalmath.com/DeltaStreamMedia/OlegGleizerModernMathematics_12_2011.pdf
The book is copy-lefted. You can use it for any non-commercial purpose.
