5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7, 5.8, 5.9, 5.01, 5.02, 5.03 ...
... An infinite number
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There are infinitely many numbers between -5 and -6. Any decimal expression starting with -5. will be a suitable number.
Let's start with an easier problem. If you want to know how many numbers are between 1 and 7, then you have 2 & 3 & 4 & 5 & 6 which is 5 numbers. If you subtract 1 from 7, then you have 6 numbers. So, to get the final answer you subtract the two original numbers and then subtract one more. In our example, 7 - 1 = 6 and 6 - 1 = 5, so the answer is 5 numbers between 1 and 7. For the given example, take 1000 - 773 to get 227, then subtract one more. So, there are 226 numbers between 773 and 1000.
There is 6 prime numbers between 1 and 13, these are 2, 3, 5, 7, 11, 13
When you consider how many rational numbers there are, the difference between any two of them is hardly ever an integer. Examples: 5 - 4/5 = 41/5 5/6 - 2/3 = 1/6 3.274 - 1.368 = 1.906 All of the nine numbers in these examples are rational numbers.
There are no prime numbers in between these numbers. The only whole number between them is 6