Linear models of number are very important as they support the development of an informal internal representation of number magnitude, called the mental number line. Different models are best suited to the teaching of different skills and understandings at different levels. This book is designed to help teachers make the best use of number tracks, number grids, and both empty and calibrated number lines. Respected educator, Paul Swan, discusses the potential stumbling blocks to student understanding in a clear and concise way, and presents teaching suggestions to combat these. There are useful lists of professional readings and references scattered throughout. Each book includes six coloured A3 game boards for the ‘Patrick the Penguin’ activity. Each activity (and there are thirty of them!) is linked to the appropriate Australian curriculum description and aligned to the core mathematical concepts. A very informative and practical resource.