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No idea what this program is for, but from the practical use point of view, the example from the image is horrendous: 35x11 is calculated trivially as 35x10+35. Not that craziness.
The picture is horrible, but the idea (maybe) was like this?
3 5 3 5 _____ 3 8 5
Installed it out of curiosity, filled with adds, regular banner and full screen ones. Looking at the contents briefly, not sure what value it really brings.
Edit: sorry that’s not really and answer to the OP question, just wanted to warn others
I don’t think there are any open source apps exactly like this yet. You could try this app in combination with a book about mental math tricks.



