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Expanded from the highly popular \"Rules that Expire\" series of NCTM articles, this essential guide leads educators through the collaborative step-by-step process of establishing a coherent and consistent learner-centered and equitable approach to mathematics instruction. Through this work, you will identify, streamline, and become passionate about using clear and consistent mathematical language notations, representations, rules, and generalizations within and across classrooms and grades. Importantly you'll learn to avoid \"rules that expire\" -- tricks that may seem to help students in one grade, but hurt in the long run. Features of this book include: abundant grade-specific examples; effective working plans for sustainability; barrier-busting tips, to-dos, and try-it-outs; practical templates and checklists; and PLC prompts and discussion points. When teachers unite across grades, students hit the ground running every year. 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