The work aims to help student teachers, primary teachers and mathematics coordinators to realize the place of mathematics across the National Curriculum subjects. The authors explore mathematics as a set of tools for thinking about, describing, evaluating and chnging the world of the child through the broader curriculum, rather than focusing on skills and concept building exclusively in the mathematical world . Also provided is advice on the effective implementation of the National Numeracy Strategy, and practical activities so that the reader can apply these ideas with confidence both within and beyond the mathematics lesson.