描述
The basis of the program is to help anyone with the help of oral arithmetic calculations to develop the maximum speed of perception of information. To begin development, you just need to select the difficulty level and click the "Start" button. After that, you will already be offered an example for which you need to give an answer! To check the answer, click the "Check" button. Also, if you want even more diverse examples, then you can gain access to the levels! The program has only 3 levels! Level 1 numbers from 0-9, Level 2 0-99, Level 3 - 0-999. Use all the features of the application!
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