The square root of 64 is 8, which is a whole number. Therefore, we can categorize the number as follows:
- Natural Numbers: Yes, it is a natural number (1, 2, 3, ...).
- Whole Numbers: Yes, all natural numbers are whole numbers (0, 1, 2, 3, ...).
- Integers: Yes, all whole numbers are integers (..., -2, -1, 0, 1, 2, ...).
- Rational Numbers: Yes, it can be expressed as the fraction 8/1.
Therefore, the number 64−−√ belongs to the sets: Rational Numbers, Integers, Whole Numbers, and Natural Numbers.
The correct answer corresponds to "Number 1": Rational Numbers, Integers, Whole Numbers, Natural Numbers.
So, the response is 1.