This document summarizes a workshop on developing mathematical thinking in grades K-2. It discusses key concepts like the enactive, iconic, and symbolic stages of learning math. It also covers horizontal and vertical mathematization, which refer to relating math ideas to real-world contexts and reorganizing within the mathematical system. Workshop activities focused on collaborative vocabulary building, problem solving in small groups, and reflecting on different solution approaches. Productive struggle and mathematical discourse were emphasized as aids to conceptual understanding. Resources for further learning were also provided.