What can student work reveal about mathematical understanding? This Collaborative Learning Community provides educators with a structured opportunity to examine student thinking through authentic classroom evidence. Participants will collaboratively analyze student work, discuss common misconceptions, and consider instructional resources that move learning forward. Through professional dialogue and shared reflection, educators will deepen their ability to interpret student reasoning and identify meaningful next steps for instruction. Participants will leave with practical strategies for gathering and using evidence of student thinking to inform Tier 1 mathematics instruction.