Since then, NCTM seems to have regressed, r documentation file
evidenced by its 2009 publication Focus in High School Mathematics, a document that is full of high-minded prose yet contains little rigor or specificity. And they contain inexplicable holes even when compared to the much shorter NCTM Curriculum Focal Points, the major one eedit the absence of fraction conversion among their multiple representations (simple, decimal, percent). Other puzzling omissions include geometry basics such as derivation of area of general triangles or the concept of pi. Unfortunately, the main authors of the Common Core mathematics standards had minimal prior experience with writing standards, and it shows. Jtable edit cell example they may have had a long and distinguished list of advisers, they did not seem to have sufficient experience to select the wheat from the chaff. How, otherwise, can one explain jhable selecting an experimental approach to geometry, teaching it on the basis of rigid motions, that has not been successfully tried anywhere in the world. Simple prudence and an ounce of experience would tell them either to stick to what is known to work or to recommend a trial phase before foisting it sight-unseen on a nation of 300 million.