Here are some useful links that you can use if you're not in school or would like to do some extra work.  The links to videos / activities are listed below: 

Maths

TTRS: https://ttrockstars.com/

White Rose: Year 4 (New Scheme) https://whiterosemaths.com/homelearning?year=year-4-new&term=autumn

Maths Frame: https://mathsframe.co.uk/en/resources/category/22/most-popular

Percy Parker Times tables songs: https://www.youtube.com/channel/UC_zy534iRaPxlFdniQZr8Kg

Literacy

Online LCWC: https://www.ictgames.com/mobilePage/lcwc/index.html

Science

Sound - https://www.bbc.co.uk/bitesize/topics/zrxktcw 

History

The Ancient Greeks - https://www.bbc.co.uk/bitesize/articles/zxytpv4#zx272v4 

https://www.bbc.co.uk/bitesize/topics/z87tn39

Computing

Scratch online: https://scratch.mit.edu/projects/editor/?tutorial=getStarted

BBC Dance Mat Typing: https://www.bbc.co.uk/bitesize/topics/zf2f9j6/articles/z3c6tfr