It could certainly be described as a simple ratio of positive integers.
271
The set of numbers that include the natural numbers, their opposites and 0 is called the set of integers.
Natural numbers do not include negatives. Integers do.
271 of the first 1000 natural numbers contain at least one digit 5. That is 27.1 % of them.
No. Natural numbers may or may not include 0, depending on who you ask (i.e. they can begin 0, 1, 2, 3, … or 1, 2, 3, 4, …), but they don't ever include the negative numbers. However, integers, which are a superset of the natural numbers (i.e. the natural numbers are contained "in" the integers), do include negatives.
All of the natural numbers and zero are called integers.
Whole numbers include 0,1,2,3.... Natural numbers are the same numbers, excluding zero.
whole numbers include numbers from 0 to infinity whereas natural numbers are the numbers from 1 to infinity
Yes.
I would call them "natural numbers". The natural numbers are normally assumed to include zero; although that was not part of the original definition.
No, natural numbers only include non-negative integers.
No. The set of natural numbers does not include fractions.