Below are a few websites that will be useful to both parents and students should a students feel they need extra practice outside of the classroom. Please let me know if you have any questions on how to use these sites.
Khan Academy
https://www.khanacademy.org/
PhET Interative
https://phet.colorado.edu/en/simulations/category/math
Desmos
https://www.desmos.com/
GeoGebra
https://www.geogebra.org/
Virtual Nerd
http://virtualnerd.com/
Art of Problem Solving
http://artofproblemsolving.com/videos