This material is produced by a project funded by the Häme Centre for Economic Development, Transport and the Environment. The project has involved LAB University of Applied Sciences, South-Eastern Finland University of Applied Sciences and Oulu University of Applied Sciences. The project period is 1.2.2023 - 31.1.2026. [br][br]The project produces easy-to-read material for reviewing mathematics. This lecture material is available in the moodle course KoKo - Towards Education, which is available at the following universities of applied sciences: LAB, Oulu and XAMK. [br][br]The target groups are school dropouts, the unemployed, those changing careers and immigrants. [br][br]The material is freely available under the Creative Commons license CC-BY-NC-SA.