ClassNinjas: Mathe lernen is a free educational app available on Android that offers an interactive and fun way of learning math. The app provides students with videos, exercises, and tests in line with the Austrian NMS/Unterstufe bis zur Matura, as well as the German Sekundarstufe 1 bis zum Abitur. The app aims to make math fun and engaging for students, and to help them retain what they learn as long as possible.

The app offers a range of features including a math quiz where you can challenge your friends and other users, and earn badges as you progress. The app also provides hints to help you solve problems, and most topics are accompanied by short and entertaining videos that explain the key concepts. With ClassNinjas: Mathe lernen, students can improve their math skills and have fun while doing it.