This week's Mr. Teacher column on education.com is all about the perils and pitfalls of third grade geometry. I'm not even talking about proofs and theorems and complementary angles or insulting angles! Just the ability to name two and three dimensional shapes often escapes my students.
I especially love it when I ask a child, "What shape is this?" and they reply, "polygon." Sure, in the Cliff Claven, Who are three people that have never been in my kitchen before sense of the question -- it's technically correct. But that's like someone pointing at Lassie and asking, "What kind of dog is she?" and you replying, "mammal."