Rational because it can be expressed as a fraction in the form of -50/1
Irrational numbers.
mixed numbers
composite
Rational positive numbers
To any set that contains it! It belongs to {1.18}, or {45, sqrt(2), pi, 1.18, -3/7}, or all numbers between -2 and 453, or improper fractions (1.18 = 19/50], or rational numbers, or real numbers, or complex numbers, etc.
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
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
odd numbers, perfect square numbers
Integers
composite