Related to my suggestion of using Turtle Art as a starting point for Python and pre-calculus, you might find these Logo books useful for exploring another direction besides Python. Pythonistas are welcome to suggest comparable Python titles, of course. And remember, Turtle Art is written in Python, so this isn't complete heresy. ^_^ http://el.media.mit.edu/logo-foundation/products/books.html Teaching With Logo, by Molly and Daniel Watt Approaching Precalculus Mathematics Discretely, by Philip G. Lewis -- Edward Mokurai (默雷/धर्ममेघशब्दगर्ज/دھرممیگھشبدگر ج) Cherlin Silent Thunder is my name, and Children are my nation. The Cosmos is my dwelling place, the Truth my destination. http://wiki.sugarlabs.org/go/Replacing_Textbooks