This volume, paired by grade band from NCTM’s best-selling series, Putting Essential Understanding into Practice series, transforms the way teachers understand and teach school mathematics. These books focus on the specialized pedagogical content knowledge that you need to teach these topics effectively in grades 9–12. The authors demonstrate how to use this multifaceted knowledge to address the big ideas and essential understandings that students must develop for success with these computations—not only in their current work, but also in higher-level mathematics and a myriad of real-world contexts.