I've been using Art of Problem Solving's problem generator in class lately. Could you help me to ask your child if they have made an account? If not, encourage them to do so.
Alcumus link here
Below is a sample problem in the category "Square Roots." Ask your child how to do. It's 16.
This is a really wonderful resource with questions sorted by topic and answer keys and written out solutions. You can also go back to past problems in the "report" tab.