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|More than 600 non-routine mathematics problems named in honor of the Dutch baroness Ecaterina Elizabeth van Heemsvloet tot Schattenberg. Each collection in the Stella Library contains five subsets, one for each course of Pre-Algebra, Algebra I, Geometry, Algebra II/Trigonometry, and Pre-Calculus.|
|Levels:||Middle School (6-8), High School (9-12)|
|Math Topics:||Basic Algebra, Arithmetic/Early Math, Euclidean Plane Geometry, Pre-Calculus|
|Math Ed Topics:||Problem-Solving|
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