Here are a variety of online math game sites I have used over the years. Break is coming up for many districts. Maybe these can fill the void and allow some learning. Several address other content areas as well.
I have also used these games for break times at school to keep students working on academics.
If you have a child learning to count money, especially at an advanced age, there are some useful money games – especially ones with coins. I have students complete problems with actual coins then enter their response online.