The number that fits into all the following number sets: natural number, whole number, and integer is 8.
- Natural numbers are positive integers (1, 2, 3, ...).
- Whole numbers include natural numbers as well as 0 (0, 1, 2, ...).
- Integers include whole numbers and their negative counterparts (..., -3, -2, -1, 0, 1, 2, 3, ...).
The number 8 fits all these categories:
- It is a natural number because it's a positive integer.
- It is a whole number because it’s a natural number.
- It is an integer because it’s a whole number.
The other options do not fit all three categories:
- π is not an integer or a whole number.
- 5.3 is not an integer.
- -3/5 is also not a natural number, whole number, or integer.
Therefore, the answer is 8.
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