I gave it a first try, most of the times I succeed in getting the correct number ...
If there is no digit selected in the keypad, you can (try to) write the digit on the board. A digit on the keypad can be de-selected by tapping on it again. So both modes, keypad and direct scribbling on the board is now supported.
The code is far from perfect any ideas to improve?
(The zip only contains the modified application, so you will need the first zip-file as well for the other files)
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