When families join the equation, they inspire and empower every student mathematician Many secondary math educators feel the gap between home and school when it comes to engaging families in their students' mathematical development. While traditional "guardian involvement" often lessens after elementary school, research shows that authentic family engagement during the critical middle and high school years can significantly impact student success. Building Family-School Partnerships in Secondary Math offers a research-backed approach to bridging this divide, grounded in the Standards for Mathematical Practice, Math Language Routines, and Funds of Knowledge frameworks. This practical guide addresses the unique challenges of secondary mathematics education-from the cognitive and social changes students experience during adolescence to the increasing complexity of mathematical concepts. Rather than adding unrealistic demands to already busy teachers and caregivers, the book provides actionable strategies that honor the strengths and knowledge that educators, students, and families bring to the learning process. Key features include: Culturally responsive frameworks that connect students' lived experiences to powerful mathematical practices Ready-to-use templates for family letters, at-home activities, and communication tools Authentic vignettes showing successful family engagement in action across diverse communities Reflection questions and activities designed for both educators and families to use together Dr. Shakiyya Bland and Dr. Julitha Rials draw from their extensive experience in mathematics education and equity work to show how genuine partnerships can help students see math as relevant to their daily lives-whether through cooking, budgeting, construction, or community problem-solving. When families and educators collaborate meaningfully, mathematical thinking grows deeper and students develop stronger identities as capable mathematicians ready for future success.