Through the investigations in this book, children reason about place value by making and using pedometers, understand related changes in two quantities by exploring parade formations of thirty-six marchers and analyse data by devising rules for earning reading certificates. Students apply mathematical ideas from the five main content areas-number, algebra, geometry, measurement and data analysis. As they work, they infer, generalise, reason by analogy, recognise relationships and make representations, and they also guess, check and revise and verify their results. The supplemental CD-ROM features interactive electronic activities, master copies of activity pages for students and additional readings for teachers.