Part of a 3 volume set. The series has three objectives: 1. To illustrate what it means to teach student-centered, problem-based mathematics; 2. To serve as a reference for the mathematics content and research-based instructional strategies suggested for pre-kindergarten to grade two, grades three to five, and grades six to eight; and 3. To present a large collection of high quality tasks and activities that can engage students in the mathematics that is important for them to learn.