Here are two websites that parents told me about. They both look pretty neat and I believe they are both being offered for free during this time. Check them out!

I Know It  

This site breaks things down by content. For example, you can answer multiplication questions, fraction questions, geometry, etc.

Prodigy

This site is a video game format. You can cruise around a virtual world, but you must answer math questions to get prizes and power ups along the way. 

Thanks for the recommendations parents! Keep them coming!!