Practise spelling words with prefixes and suffixes on these sites:

http://www.bbc.co.uk/schools/ks2bitesize/english/activities/spelling.shtml

http://www.harcourtschool.com/activity/book_buddy/arthur/skill.html

http://www.manythings.org/wbg/prefixes-jw.html

http://www.manythings.org/wbg/prefixes-mw.html

http://www.e-gfl.org/e-gfl/custom/resources_ftp/client_ftp/teacher/other/spark/spinwin/spinwin.html#