Think Through Math - provided by state of Texas for all students in grades 3-8
River Deep Math - contains lessons assigned by classroom teacher; click here for Parents' Guide.
Skills Practice - language arts and math
Math - activities by grade level
Math Playground - fun educational math games
Money - practice counting money
Multiplication.com - games to help you learn how to multiply
Big 6 Research Links:
5th Grade - Decades of the 20th Century