Fun Sites with a purpose:

 https://beta.freerice.com/

 https://kids.nationalgeographic.com/

 https://www.funbrain.com/

https://www.brainpop.com/

https://www.canadiangeographic.ca/kids

 https://www.cbc.ca/kidscbc2/

https://www.coolmathgames.com/

 https://www.starfall.com/h/

 

Other sites with links to explore:

https://www.educationworld.com/a_curr/curr229.shtml

https://www.mastersindatascience.org/blog/the-ultimate-stem-guide-for-kids-239-cool-sites-about-science-technology-engineering-and-math/