You may not need to convert the value into a string in the first place; in fact, it would be a lot easier not to.
You can grab the two nybbles in a byte like so:
[box]
lower = number And 15
upper = number Shr 4
[/box]
You can grab the two nybbles in a byte like so:
[box]
lower = number And 15
upper = number Shr 4
[/box]