Explore how schools and districts can realize the full academic potential of the growing population of Multilingual Learners in mathematics. With over 2.2 million such students in U.S. schools as of 2021, their participation and success in math classrooms are more important than ever. Drawing from research, this WestEd Perspectives piece outlines policies and practices that enable meaningful access to math content, support conceptual understanding, and foster active participation. It also offers guidance for state and district leaders on aligning policy, instructional materials, and professional development to ensure Multilingual Learners are effectively supported in developing both mathematical understanding and language skills in the classroom.