I am a seventy-five year old retired math instructor. I was at Southern Oregon University for twelve years. I had taught at the College of the Siskiyous in Weed California for twenty-six years. Prior to that I worked as a computer programmer, carpenter and in various other jobs. I graduated from Rice University in 1967 and have a MS in Operations Research from Stanford. In the past I have hand-built a stone house and taken long solo bicycle tours. Now I ride my mountain bike and play golf, go and bridge for recreation.
Jim in His Reading Corner
Math Thoughts 
Professor Hatton,
I am a college student studying to teach math grades 6-8. I found your crisscross applesauce method on your blog. I would like to use this method in a presentation that I will be doing for a class and wanted to make sure that I had the appropriate permission first. Do you mind id I include this method in my presentation?
Yes. Please do. Good luck in your presentation.