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train mental calculation
A simple mental calculation trainer with this features:

- contains the four elementary arithmetic operations and the prime factorization
- configurable task types and diffculty
- configurable number input field
- statistic about the performance
- multi user support


Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid