Build a mathematics teaching community that promotes learning for K-12 educators and students. This user-friendly resource is divided into two parts, each covering a key team action for mathematics in a PLC at Work™. First you will discover how to coach highly effective mathematics teams within your professional learning community. Then you will learn how to utilize collaboration and lesson-design elements within your math curriculum for teacher team reflection, data analysis, and action. Learn to lead math teacher teams and foster effective collaborative teaching strategies: (1) Build a collaborative math learning culture that engages and promotes learning for students and staff members; (2) Optimize coaching and foster equity and belonging to encourage collaboration; (3) Engage in mathematics lesson study to help teams learn from one another and reflect on effective strategies in teaching mathematics; and (4) Develop norms, SMART goals for teachers, agendas, and a plan for working effectively as a collaborative team in a PLC at Work™. [This is a joint publication of the National Council of Teachers of Mathematics and Solution Tree.]