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 photocopiable activities, plus teachers' notes that explain the purpose of each activity, its relevance to the National Curriculum and suggest ideas for follow-up activities.