This book addresses a gap acknowledged in the Common Core State Standards for Mathematics (CCSSM): “It is … beyond the scope of the Standards to define the full range of supports appropriate for English language learners.” Authors of the ten chapters that compose this collection focus on pedagogical practices that can support ELLs and their teachers in meeting the content and language demands of CCSSM. Each chapter features detailed classroom-based vignettes that highlight specific pedagogical practices that teachers can use to support ELLs in building their skill with the practices identified in the Standards for Mathematical Practice, and each concludes with questions for reflection and suggestions for action plans. CCSSM has been adopted by most states in the country, and mathematics educators must attend to the needs of language learners as they respond to this widespread adoption, implement the new standards in their classrooms, and ensure their students’ success.