Unlock the power of deep, conceptual understanding in your math classroom with the transformative Concrete-Representational-Abstract (CRA) instructional sequence. In this professional development session, secondary math educators will explore how the CRA model supports Response-Based Instructional Strategies (RBIS), moving from tangible, concrete manipulatives to visual representations, and finally to abstract symbols to help students build mastery. Participants will develop a CRA-based progression tailored to their curriculum and create formative assessments that facilitate personalized, student-centered learning plans. This session offers practical tools and strategies for making complex math accessible and engaging, fostering a deeper understanding for all learners. In this self-paced online session, participants will engage in interactive learning tasks using Desmos Classroom platform.