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|Johnson, Nanette; and Kaplinsky, Robert|
|"Open middle" problems, hints, and answers, all aligned to the Common Core State Standards (CCSS). Introduced by Dan Meyer, these kinds of math challenges have a "closed beginning," meaning that they all start with the same initial problem; a "closed end," meaning that they all end with the same answer; but an "open middle," meaning that there are multiple ways to approach and ultimately solve the problem.|
|Levels:||Elementary, Middle School (6-8), High School (9-12)|
|Math Topics:||Basic Algebra, Arithmetic/Early Math, Euclidean Plane Geometry, Pre-Calculus, Data Analysis, Probability, Statistics|
|Math Ed Topics:||Common Core|
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