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