Because the primary aim of this website is to share notes/books I have written for the Danish stx, most of the material is in Danish.
However, for the past few years I have taught a mathematics class in English, and I have, therefore, translated a few of the books into English (corresponding to the Danish B-level in mathematics).
Basic Course Math
Linear functions, piecewise linear functions, and linear regression.
Mathematical operations, algebra, equations.
Plane geometry based on vectors.
Mathematical functions in general; different types of functions.
Interest and annuities
Simple interest, index numbers, savings and loans.