Seeing Numbers, Introducing subQuan is currently available in PDF format. The book is pre-published and is made available for homeschool and class use.
Frequently Asked Questions (FAQ's)
Can I really start teaching my 4 year old subQuan?
Can subQuan be used to help teach calculus?
This is so easy. Why don't they teach it in schools?
Why are rectangles used to introduce negative numbers?
And many, many more