extends students' breadth of knowledge beyond, but related to, the topics covered in elementary and middle-grade curriculums; it increases prospective teachers' depth of mathematical understanding by providing problems rich in exploration and mathematical communication; and it models the most current ways of teaching mathematics.Many Section Openers begin with a motivating lesson that introduces a new topic in an understandable, real-world context.Exercise Sets at the end of every section provide more traditional practice and are labeled either Proof Exercises or Writing Exercises.Exploratory Exercises at the end of every section lead students to investigate topics outside the framework presented in the section. The final exercise in each section is a writing exercise.

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