Whether you are a beginning or experienced teacher, NCTM’s Essential Understanding Series was developed with you in mind. This series addresses topics that are critical to the mathematical development of students but can be difficult to teach. But when teachers are really on top of the concepts, they have a foundation and focus that allow them to teach these topics in multiple ways. Sixteen volumes are planned for the series.
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Developing Essential Understanding of Number and Numeration for Teaching Mathematics in Prekindergarten–Grade 2
Developing Essential Understanding of Ratios, Proportions, and Proportional Reasoning for Teaching Mathematics in Grades 6–8