It is a difficult-to-use calculator that randomly displays the keys. If you have time to calculate, please use it. Click the "RESET" button to return to normal. Touch it again to display it randomly.
You can also calculate the abacus. If the number of digits and the number of calculated numbers are set in the settings, the problem will be displayed in the text box. Please use it for practicing the abacus.
The only problem is addition and subtraction.
When you move the abacus ball, a number indicating it will appear in the text box.
It may be better not to use it when you are busy.
Difficult to use keyboard layout start (keys are randomly arranged and difficult to use) Of course, decent arrangement can be used.
You can also calculate the abacus. If the number of digits and the number of calculated numbers are set in the settings, the problem will be displayed in the text box. Please use it for practicing the abacus.
The only problem is addition and subtraction.
When you move the abacus ball, a number indicating it will appear in the text box.
It may be better not to use it when you are busy.
Difficult to use keyboard layout start (keys are randomly arranged and difficult to use) Of course, decent arrangement can be used.
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