The Editorial Panel of Teaching Children Mathematics (TCM) welcomes you to volume 13! We are committed to the goals and ideals summarized in TCM's mission statement, which can be found at the bottom of the masthead page of each issue. The mission statement embraces the NCTM ideal of more and better mathematics for all students through the exchange of mathematical ideas, activities, and pedagogical strategies and through sharing and interpreting research. In view of NCTM's professional development focus of the year—“Show Me the Mathematics: Learning through Representation” (www.nctm.org/focus/)—we would like to highlight the specific mathematics represented in this volume of Teaching Children Mathematics.