Firstly, consider the first ten natural numbers to be:
From this, we should take the 'range' of the following numerals by subtracting the highest number to the lowest number.
Thereby the answer is 10-1 which is 9!
So, I consider the answer to be 9 :).
Ps- I accord importance to this question and hope my answer is marked as the brainiest answer. Also, I appreciate such math questions which enhance our skills!