Below you can find the addresses of useful websites. Some are for games, others can help with homework.
Games
http://www.bbc.co.uk/schools/websites/4_11/
http://www.bbc.co.uk/schools/ks2bitesize/
http://www.primarygames.co.uk/
http://www.netrover.com/~kingskid/108.html
http://www.uptoten.com/kids/boowakwala-navigation-games.html
Homework
http://www.homeworkelephant.co.uk/
http://www.woodlands-junior.kent.sch.uk/Homework/
Parents
http://www.bbc.co.uk/schools/parents/
More Fun Web-Sites
www.eduplace.com/math/brain
www.gridclub.com
www.factmonster.com