This book supports trainee and beginning teachers to understand what 'mastery' is and how to effectively integrate it into class teaching. It explores how 'mastery' is viewed and supported in other countries and encourages a critical examination of this topical theme. The text includes practical advice and examples of learning activities for primary teaching. It also outlines how to support children who might be weaker in their mathematical abilities and still ensure that all children master mathematics. The text also supports those who are developing whole school mastery approaches and looks at how we can assess 'mastery' as well as how we can be confident that it is supporting good progress. The text considers the range of evidence around the 'maths mastery' approach and supports schools and teachers to develop better understanding of mastery, what it really means and how they can deploy it in the classroom.