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The book " Problems to Think" contains 250 challenging and entertaining math problems for middle school children. The problems include a variety of topics: numbers, order of operations, sequences, word problems, and many others. The majority are unconventional according to the standards of most middle school math programs. The problems have different levels of difficulty, from quite basic to what might appear on intenational junior mathematical competitions. The carefully selected interesting and challenging problems are accompanied by clear solutions, sometimes with discussions of other...

This book covers the main facts you need to know and remember during and after studying Geometry. They are presented in a logical progression for your ease of understanding and subsequent reference. The following topics are covered: - The laws of logic, postulates, definitions, and theorems for the properties of plane and solid geometrical figures - Coordinate geometry, vectors, and transformation geometry - A brief presentation of the most famous theorem in projective geometry - A comparison of the fundamental differences between Euclidean, Lobachevsky, and Riemann Geometry. This book...