Mathematics! But what is it good for? Almost every teacher has faced this question. This book makes the (additional) value of mathematics tangible by introducing algorithms that can solve a variety of practically relevant problems. Building on basic knowledge of calculus and linear algebra, we take a journey through applied mathematics: starting with solving linear and nonlinear systems of equations, moving on to linear optimization, and culminating in modern methods of computer algebra. This way, you can easily find a suitable topic to actively connect your students' real-world experiences with mathematical methods: whether by predicting population development based on real data or optimizing economic processes. Or even by tackling seemingly well-known tasks.