Nelson Website - Great stuff for parents and students http://www.nelson.com/nelson/school/elementary/mathK8/default.html
Virtual Manipulatives Online! Your child can use any manipulative we have at school...at home! http://nlvm.usu.edu/en/nav/vlibrary.html
University of Waterloo...neat math stuff! Check it out! http://cemc.uwaterloo.ca/wired_math/
Check out this page on how to write a good explanation essay and what it should include. How to Write a Good Explanation Essay