The "Heinemann Mathematics" series is a lively new resource, intended to make maths interesting and relevant for pupils. It has been designed to place maths in real-life contexts, help pupils become confident problem-solvers, help pupils use and apply maths skills, ensure continuity and progression for high and low attainers, offer detailed teacher support and match the new curricula in England, Wales, Scotland and Northern Ireland. "Heinemann Mathematics 9", intended for Year 9, provides revision and consolidation of Level 5 and main coverage of Level 6 material. Additionally, this "Extension Textbook" covers selected topics from Level 7. The "challenges" throughout the "Core Textbook" should stretch all pupils within the context of the core. And for more able pupils, this "Extension Textbook" develops concepts from the core. It gives more challenging contexts and goes into topics in greater depth. Pupils are encouraged to work together, discussing and evaluating their ideas, and to investigate the topics further for themselves.