Reading
https://www.starfall.com/h/
www.abcya.com
www.abcmouse.com
Math
https://www.abcya.com/games/shapes_geometry_game
https://www.sheppardsoftware.com/preschool/preschool.htm
https://www.funbrain.com/pre-k-and-k-playground
https://www.topmarks.co.uk/maths-games/5-7-years/addition-and-subtraction