This activity-based, photocopiable resource pack is a flexible source of teaching material for Key Stage 3 Mathematics. It aims to develop both pupils' understanding of mathematics and their computational ability through a range of interesting, enjoyable and challenging activities based on ideas extensively trialled in schools. In order to understand, apply and retain mathematics, children must not only read and write about the subject, but also listen and talk about it. It is through reflecting, justifying, verifying and questioning that they will consolidate their understanding. The material in the book: uses pupils' own experiences as a source of learning activities; increases awareness of the relevance of mathematics to their lives; encourages interaction with people and the manipulation of materials in a wide variety of situations; develops the use of spoken and written language to gain meaning from mathematical experiences; encourages pupils to describe and record relationships as well as discover and create patterns; and sustains skills through meaningful practice. The book contains over activities designed to help pupils appreciate and understand the mathematical structures behind the tasks they are asked to perform. Each unit contains the following components: main focus - outlines the general mathematical ideas behind activities in the unit; activities - a range of highly-illustrated student activities on photocopiable sheets; notes for teachers - outlines of possible classroom approaches; further activities - suggested follow-up ideas and strategies; resources - lists resources needed for the unit; learning outcomes - details specific outcomes achievable through the activities; and evaluation - notes to help teachers judge the effectiveness of implementation. The units are structured to meet pupils' varying aptitudes and perspectives and activities can be modified to meet the needs of pupils while maintaining the main teaching and learning purposes.