Website: http://www.angelfire.com/oh/aryehkramer/index.html
You may also like
Website: https://www.universalclass.com/
Website: http://www.educationalfreedom.com/heart
Website: http://homeschooling.about.com/od/mathfunandgames/Math_Fun_and_Games.htm
Website: http://www.homeschoolbuilding.org/Item.php3?id=5749