I’m not sure how to explain this, but I would like to when my GUI displays fx. health. It would write it as 005% instead of just 5%. Like when you round up numbers with .ToString(“F1”)
0.05f.ToString("000%")
this will return “005%” if you use float from 0 to 1
5.ToString().PadLeft(3, '0') + "%"
gives same result, if you use int from 0 to 100
There is a lot of interesting things you can do with strings formatting 
nice examples