On the number line they do.
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No. Decimals come under "real numbers" and not natural numbers as natural numbers are positive whole numbers i.e., positive integers.
There are 25 prime numbers before 100.
All positive numbers come "after" 0 (or -0, if you prefer).
-12
The set of integers consists of zero, the natural numbers and their inverse (negatives). This is denoted by a boldface Z standing for the German word Zahlen. It means that Z is a subset of the sets of rational and real numbers and is countably infinite.