There is one book for each year group. They contain photocopiable resources organized into three chapters: Making decisions, Reasoning about numbers or shapes, Problems involving real life, money or measures. Years 1 and 2 also contain a chapter on Organizing and using data. Each chapter contains six lessons, one for each half term. The length of the problems are varied in each book with short, medium and more extended problems for children to solve. The problems on each page are mixed so the children do not assume that the solution process is the same each time, but have to understand the problem. They are varied in their complexity and are presented in a meaniful, age-appropriate manner with topics the children will find relevant.