Elementary and Middle School Mathematics: Teaching Developmentally, Professional Development Edition provides unparalleled depth of ideas and discussion to help mathematics coaches and other teacher leaders foster teachers' understanding of the mathematics they will teach and the most effective teaching methods for the various mathematics topics. This text reflects the philosophy of the NCTM and Common Core State Standards and the benefits of problem-based mathematics instruction. The Coach/Teacher Leader Guide to this Book and Activities Matrix that appear at the front of the book and Professional Learning Opportunities sections, Coach/Teacher Leader Considerations boxes, and PDToolkit boxes that appear at the end of each chapter ensure this book is a valuable resource for all educators who facilitate mathematics professional development and support students making sense of mathematics.