This is a great website for further practice at home. Simply select the
grade level and the objective you wish to work on. They are listed
according to subject ( math, reading, science, etc.)
http://internet4classrooms.com/
Fourth Grade Social Studies is all about the United States. This website
does a great job in explaining topics such as the election process, branches
of government, historical documents. etc.
http://bensguide.gpo.gov/3-5/index.html
A great website for students to understand the many responsibilities of
being president!
http://www.scholastic.com/kids/president/