I don't understand what you don't like about that problem. It's not very computationally intensive. Basically it tests if you know what these matrices look like

I don't understand what you don't like about that problem. It's not very computationally intensive. Basically it tests if you know what these matrices look like, if you know how matrix multiplication works, and if you know that matrix multiplication is composition. These are all important ideas to reinforce. There aren't graphical examples because it's a single problem on a list, not an explanation in a textbook chapter.