Mathe-Trainer

Mental arithmetic practice on a tablet, for children from their first school year. The app measures the time to the correct answer and turns it into a learning curve and leaderboards, where several children on the same device compete with each other. The interface is in German only. It runs entirely offline. No account, no ads, no analytics and no internet permission - the app cannot send anything anywhere. 83 lessons in ten groups Counting and comparing pictures for the youngest, then addition and subtraction up to 10, 20, 100 and 1000 - with and without carrying - whole thousands and hundreds below ten thousand, the times tables forwards and backwards, division with and without a remainder, order of operations, telling the time and handling money. Stars for care, lightning bolts for speed Two separate axes on purpose. Stars follow the error rate, bolts the time per task. A child who works carefully earns the stars even slowly. What parents can set Behind a PIN: which groups a child is offered at all, how long they may practise in one stretch and per day, how many runs of one lesson still count towards records in a day, and whether difficult tasks are woven back in. Assignments too: give a child a lesson, daily or weekly, or as a plan for one named day, with a minimum of stars and bolts to reach. Your data stays with you Everything lives in a database on the device. A backup is written only when you ask for one, and handed to Android's share sheet - where it goes is your choice.