Data is stored internally in binary.
Right! Where is that "decimal" number coming from? Because, if it's already in the Arduino's memory it's already in binary. BTW -
If you are working with binary a lot, it's worthwhile to learn how to convert between hexadecimal and binary. It's a lot
easier than decimal and you can convert between hex and binary in your head (any number of bits/digits).
And if you
need to do convert constants while programming, the Windows calculator can convert between decimal, binary, hex, and octal (if you switch the the scientific