Calculab

To train mental calculation, 30-second tasks are proposed where you have to get the greatest number of correct answers without failing.
Each correct answer will add a point to the counter, but if an error is made in the operation, even in the last second of time, the point counter will reset to zero.
There are four game modes available: addition, subtraction, combined addition and subtraction, and multiplication.
In each of these modes, the maximum record that can be seen in the "RECORDS" section will be saved.
In the "SETTINGS" section you can activate the TRAINER mode, which allows you to play without a time limit (in this mode, records are not saved).
Are you capable of having the best record in your class?