This is one of the great examples where education is about teaching people how to think for themselves instead of merelyrecalling facts (which has its own place). Considering that repositories for information are now more fluid and accessible, what's left for us (and even challenged by narrow AI) is the ability to synthesize new insights from preexisting concepts. Great post and I'd definitely like to see more of your stuff. Thanks!
RE: “Singapore Math”: Finding the Area of an Unfamiliar Quadrilateral