To improve your mental maths skills try playing the maths games found here:
http://www.ictgames.com/resources.html

To help remember all your sounds, practise at home with these fun phonics games:
http://www.ictgames.com/literacy.html

Work through these levels to get those typing fingers going:
http://www.bbc.co.uk/schools/typing/

Older children will enjoy these maths games:
http://www.topmarks.co.uk/maths-games/7-11-years/

These English games for 7 – 11 year olds:
http://www.topmarks.co.uk/english-games/7-11-years/

And here’s some lovely literacy ideas…
http://resources.woodlands-junior.kent.sch.uk/interactive/literacy/index.htm

Some ideas for little ones:
http://www.crickweb.co.uk/Early-Years.html
http://www.topmarks.co.uk/maths-games/3-5-years/counting