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train mental calculation
Version: 1.6
Added: 10-08-2020
Updated: 01-03-2021
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
- time trial mode (solve as many tasks as possible within a defined time) with tasks depending on the wall clock time so that one can play "against" another one with the same tasks

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