The predominant interpretations of the Common Core Standards appear to be reinforcing the growing displacement of exercises involving arithmetic concepts with those involving the classification of shapes.
Engage NY's 3rd grade curriculum, for example, has a whole unit devoted to polygon classification, culminating in exercises like this one:
Even Singapore Math is getting in on the game. Compare a question in its 3rd grade Common Core Edition placement test:
..with the corresponding question in its (much shorter!) 3rd grade 3rd and U.S. Edition placement test:
1. Discuss how the Common-Core shape classification problems overemphasize labels over concepts.
2. For the purposes of preparing children for 21st century colleges and careers, are labels more important than concepts?