How to map the + , - , * and / key to the keyboard (Macos) ?

[jongena]

I was able to map the numbers to the push button keys, but so far I could not map the operations +,-, * and / to a qwerty keyboard
where these operations are on "shifted" positions ? My device is a Mac running Monterey as OS.

[hneemann]

On my machine this works:

[xotmatrix]

Less than ideal on Windows with a US keyboard.

EDIT:

OK, your example works with the Numeric Keypad (which I don't have on my normal keyboard).