This book examines how mathematical mastery, influenced by East Asian teaching approaches, can be developed in UK schools to enhance teaching and to deepen children's mathematical knowledge. It gives guidance on using physical resources to demonstrate key concepts, extended examples on how to teach different curriculum topics and how to plan for small-step progression. It argues that effective mastery teaching requires careful and knowledgeable support for primary teachers who may not yet be maths specialists. New to this second edition: New chapter on variation theory and practice Updated case studies exploring how mastery teaching has evolved Updated review of current mastery resources available to UK teachers Robert Newell is a lecturer at the UCL Institute of Education, London.