Mathematics is mathematics for the secondary school, designed for those who want to master maths. Contains 780 tasks and 60 characters.
It is built up so you can choose the theme on the list. First, there is some introductory theory, so there are examples that consist of questions, answers and explanations. Starting with simple tasks, then increasing in difficulty. The explanation provides useful tips, and often an idea of how to think. At the end of each chapter you will find questions where you can test your knowledge.
Solid knowledge is a good investment for the future. Mattresses are also a great tool for parents who want to refresh their maths, in order to help the youth.