This is the skill I explain to my children as communication. It's why you sometimes (often) have to show your work in math, even though the intervening steps seem obvious (or invisible, for some of the most math-y kids), and why the answers to your science test questions sometimes have to be in complete sentences. Some day, when you are solving real problems and inventing/discovering novel skills/processes/tools, etc., you will need to be able to communicate your thought process in sufficient detail that a person with no prior knowledge of your process (but reasonable general content expertise) would be able to reproduce it based on your documentation. So right now, your learning objective is not really only (or even primarily) the surface content of the assignment (which may be both lacking in cognitive challenge and personally irrelevant), but the highly transferable long-term skill of communicating your thinking. Effective communication is what will extend the reach of your thinking, problem solving and creativity beyond your immediate circumstances.
