About Kopfrechentrainer (Privacy Friendly)
Kopfrechentrainer (Privacy Friendly) is a mental-arithmetic trainer for practicing addition, subtraction, multiplication, and division. Players choose an operation and one of four difficulty ranges, from numbers up to 10 through numbers up to 10,000. Each round contains ten exercises, and the score reflects both the number of correct answers and the time taken. At the end of a round, an overview shows which problems were answered correctly. An optional direct-feedback setting reports correctness after each individual exercise instead. The app requires no permissions and contains no ads. It provides short practice sessions with adjustable number range and feedback style. This supports repeated mental arithmetic practice.
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