Consider, for example, the number 420109. It's quite big, isn't it? Not so far from half a million. Yet it can be made to be smaller than a hundred with a very simple trick, without putting any mathematical operators between the digits, without using any mathematical function on it, and without erasing or hiding parts of it.
There are a few other 6-digit numbers this could work with, but not many.
Not only can it "be made smaller", 420109 actually is smaller than 100 from a certain viewpoint. There are very few 6-digit numbers where this can be applied.