http://www.bbc.co.uk/bitesize/ks2/
This website has information and games for science, maths and English.
https://www.topmarks.co.uk/maths-games/7-11-years/mental-maths
Mental maths games
https://www.echalk.co.uk/maths/primarynationalstrategy_yr6/dfes-mathsactivitiesforyear6/
https://claritymaths.uk/games/
Maths games
http://www.math-exercises-for-kids.com/learning-mathematics-9.htm
Maths activities
https://www.topmarks.co.uk/english-games/7-11-years/spelling-and-grammar
Spelling, Punctuation and Grammar games
https://spellingframe.co.uk/
Spelling activities
http://www.primaryhomeworkhelp.co.uk/literacy/
Literacy related games
http://www.interactiveclock.com/countdown-clock-and-letters-resource.html
Countdown
http://www.funenglishgames.com/readinggames.html
Reading activities