NJ PRIME is a partnership among 12 schools from Bayonne, Weehawken, Union City, and Elizabeth and Stevens Institute of Technology to provide school-based teams of K-5 elementary teachers with professional development that will strengthen their content and teaching expertise and prepare them to be effective mathematics teacher leaders. The 3-year program is designed to ensure that participants can engage students in deeper conceptual understanding, critical thinking, and problem-solving in the topic areas now emphasized by the Common Core State Standards in Mathematics and facilitate their use and understanding by other elementary teachers in their districts.