Math Manipulatives 

https://toytheater.com/category/teacher-tools/virtual-manipulatives/

https://www.mathlearningcenter.org/apps

https://www.didax.com/math/virtual-manipulatives.html

https://mathigon.org/polypad

https://www.mathplayground.com/math_manipulatives.html

Math Practice 

https://www.reflexmath.com/

https://sso.prodigygame.com/game/login?rid=a7799f37-31fc-4df7-a9b3-d9eab16d4899