help breaking down number inti 100s 10, 1s

this is probably easy to do but i cant think how at the moment.

how could i take an 8 bit number in a file and break it down into the 100s
10s and 1s and
put the results into three other files so for example if i had 11001011
which is 203, how can i
put 2 in the hundreds file, 0 in the tens  and 3 in the units file.

would this be done best in a lookup table?

thanks in advance for any advice

Hayley