Numeracy
http://resources.woodlands-junior.kent.sch.uk/maths/numberskills.html
http://www.ictgames.com/resources.html
http://www.topmarks.co.uk/Search.aspx?Subject=16
http://www.primaryhomeworkhelp.co.uk/maths/index.html
http://www.bbc.co.uk/bitesize/ks2/maths/
http://www.primarygames.co.uk/ (these are evaluation versions only but are still very good games)
http://skoolbo.co.uk/ (you will need your Skoolbo login)
www.studyladder.co.uk/ (you will need your Studyladder login)