Simple Unity math game that teaches children addition, subtraction, multiplication, and division. Unity version is 6 preview, 6000.0.22f
This is more a showcase of code organization in Unity, on how to separate concerns, logic, and presentation. There's also example of unit tests and UnityTests.
Open scene inside _Project/_Scenes, LearnMath, and run. In the Unity editor if clicks aren't working you need to activate simulate touch input from mouse (Window -> Analysis -> Input Debugger)