Build collective teacher efficacy and students' mathematical thinking using the Mathematics in a PLC at Work™ lesson-design process. This second edition of the popular "Mathematics Instruction and Tasks" book guides preK-12 teacher teams in ensuring improved mathematics achievement. Gain new and enhanced understanding of research-affirmed instructional routines, and learn how to efficiently elicit high levels of student engagement and self-efficacy. Implement instructional strategies and methods of teaching mathematics in a professional learning community. This book will help preK-12 mathematics teachers and teacher teams: (1) Identify essential mathematics content standards students learn during a unit; (2) Understand the importance of communicating the why of the essential mathematics learning standards to students; (3) Plan for the use of balanced rigor and mathematical routines to teach each content standard during instruction; (4) Use a balance of appropriate mathematics activities and tasks needed to develop conceptual understanding, procedural fluency, and application of mathematical concepts and skills; and (5) Implement instructional math routines that ensure the formative learning of all students during lessons. [This is a joint publication of the National Council of Teachers of Mathematics and Solution Tree.]