For example, 8.21 is what 8.211 would be, if rounded to the nearest hundredth.
some of the numbers (if you use the usual rounding mechanism) that are rounded to 8.21 like this are:
8.211, 8.2111, 8.2111111111, 8.2132323.... and infinitely many more (you can make more by adding 1s at the end of these numbers, for example)