Mattetrin Lite shows some examples and info on how the app works. The entire version with secondary school mathematics is a paying version in Norwegian which gives you 780 tasks with questions, answers and explanations. There are figures of 60 of the tasks.
You learn the basic rules step by step, with increasing difficulty on the tasks. Matte step wants to give you the key to the pattern of mathematics. The app can be used as support in secondary school, or to repeat rules when you go to upper secondary school.