Mathletics is a multi-award winning learning resource that encourages students and rewards results – hugely popular with pupils, teachers and parents alike. In school we celebrate success by awarding certificates for points gained in Mathletics every week.
Login to your Mathletics account here.
BBC Bitesize is a useful page. Some of the materials are not quite age appropriate at the moment as the site is currently being developed to match the new curriculum. However, it is a good resource and is continually improving.
Woodlands Junior is an excellent site with games and challenges in maths and grammar.
Topmarks have some free grammar and spelling games.
Swaffield have excellent resources providing definitions of grammar which are excellent for revision.