GUI Counter Format

Im wanting to set up GUIs for number counters such as the score, lives, and such. But I want it to have zeros that fill in instead of making it blank. Just like old Nintendo games...scores have a bunch of zeros that will fill in as the score goes up. Or if a timer is counting down and it starts with 2 figures and gets down to 1, it will have a 0 in front...For example:

10, 09, 08,...

Or a score that starts with 000000, it goes up to 000100, 000200....

Anyone?! =)

Thanks!