Sometimes you just need a simple, no thrills place to practice something simple.
Here is a webpage that links to a simple addition, simple subtraction, simple division and simple multiplication checker.
It provides the following items -Save state for the visit -A simple ratio of Correct to Incorrect -No ID required or IP Logging attempted -Open Source Code for Review
This is supposed to be intuitive to a 2nd grader and difficult for a 1st grader. While also being accessible to other parents who are looking for something to make their kids do instead of Roblox.