This book is part of the Essentials series of photocopiable books designed to offer the non-specialist teacher a wide range of open-ended maths activities for specified levels of ability. The series provides activities to support any scheme of work being used in the school, either as part of a structured science lesson or as educationally-sounded time-fillers. This book contains activities that investigate a range of Attainment Targets from 1 to 4. Each book contains 28 pages of photocopiable activities, plus four pages of teachers' notes that explain the purpose of each activity, its relevance to the National Curriculum and suggest ideas for follow-up activities.