It is: 999.999 minus 899.999 = 100
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It is called a [decimal] fraction.
6.03 IS expressed using decimal form!
There is no such example. If you cannot use an exact fraction then there will not be an exact decimal that you can use instead. And, if you are using an approximate decimal, you could use an approximate fraction instead.
You cannot be sure that what appear to be a non-repeating decimal does not in fact repeat after, say, a million places, in which case it would be equal to a certain fraction. If it really is non-repeating, then it is irrational, which is a fancy way of saying it does not represent a fraction using two integers.
1.1429