Natural (counting) numbers; integers; rational numbers; real numbers; complex numbers. And any other set that you choose to define, that happens to include the number 4 - for example, the set of square numbers, or even numbers, the set of the numbers {3, 4, 5, 7, 14, 48}, etc, the set of numbers containing the letter o in their English name.
4 belongs to any set that contains it. So {1, pi, 4, -37.5689, sqrt(2)} is a possible answer.
Irrational numbers.
mixed numbers
composite
The fraction ( \frac{12}{4} ) simplifies to 3, which is a whole number. Therefore, it belongs to the set of integers, as well as the set of rational numbers since it can be expressed as a fraction of two integers. Additionally, it is also part of the set of real numbers.
-5
The set of numbers which 3 does not belong is the set of even numbers.
10 belongs to the set "natural numbers", but it can also belong to whole numbers, and rational numbers
4 belongs to any set that contains it. So {1, pi, 4, -37.5689, sqrt(2)} is a possible answer.
Counting numbers
Irrational numbers.
The set of even numbers
It belongs to the set of prime numbers
Rational and Real numbers
rational and prime numbers
mixed numbers
Integers