Not everyone has the ability to go to a school that uses the WoodinMath whole-to-part curriculum... yet. Until that time comes, I'm trying to get my materials to the students that need it. To be fair, that means that I intend to offer materials on this site without charging for them. That does not, however, prevent people from sending me bills. So, if you can help offset the thousands of hours spent on this project that would be great!