This fourth book in the Mathematics Recovery series equips teachers with detailed pedagogical knowledge and resources for teaching number to 7 to 11-year olds. Drawing on extensive programs of research, curriculum development, and teacher development, the book offers a coherent, up-to-date approach emphasizing computational fluency and the progressive development of students' mathematical sophistication. The book is organized in key domains of number instruction, including structuring numbers 1 to 20, knowledge of number words and numerals, conceptual place value, mental computation, written computation methods, fractions, and early algebraic reasoning. Key Features: Fine-grained progressions of instruction within each domain Detailed descriptions of students' strategies and difficulties Assessment tasks with notes on students' responses Classroom-ready instructional activities An accompanying CD with extensive instructional resources This book is designed for classroom and intervention teachers, special education teachers, and classroom assistants. The book is an invaluable resource for mathematics advisors and coaches, learning support staff, numeracy consultants, curriculum developers, teacher educators, and researchers.