Mathematics 10E MYP 5 (Extended) third edition has been designed and written for the International Baccalaureate Middle Years Programme (IB MYP) Mathematics framework, providing complete coverage of both the Standard and Extended content outlined in the framework. This book is recommended for students intending to progress to one of the Higher Level (HL) courses in the Diploma Programme. Discussions, Activities, Investigations, and Research exercises are used throughout the chapters to develop conceptual understanding. Material is presented in a clear, easy-to-follow style to aid in comprehension and retention, especially for English Language Learners. Each chapter ends with extensive review sets and an online multiple-choice quiz. The associated digital Snowflake subscription supports the textbook content with interactive and engaging resources for students and educators. The Global Context projects highlight the use of mathematics in understanding history, culture, science, society, and the environment. We have aimed to provide a diverse range of topics and styles to create interest for all students and illustrate the real-world application of mathematics. We have developed this book in consultation with experienced teachers of IB Mathematics internationally but independent of the International Baccalaureate Organisation (IBO). It is not endorsed by the IBO. We have endeavored to publish a stimulating and thorough textbook and digital resource to develop and encourage student understanding and nurture an appreciation of mathematics.