The same old story: After the summer holidays, hardly any student can remember how to work with fractions. You want to introduce a new topic and find that your students do not master the basic skills or have forgotten them. Even in higher grades, there is often a lack of fundamental mathematical skills. With our "Math Basics" series, we provide you with very simple and immediately usable worksheets for effective review of basic mathematical skills. The basics are explained in such a straightforward and visual manner that every student can understand and internalize them—indeed, even independently. Each concept is first explained using the simplest possible case, the solution process is illustrated visually, making it comprehensible and memorable for the student. After a second example, there is a word problem with real-life content.