What subset does 18 belong to?

Answer 1

Rational, Integer, Whole, Real Number and Natural number

Answer 2

To any set that contains it!

It belongs to {18},

or {sqrt(2), 18, pi, -3/7},

or {18, bananas, France, cold}

or all whole numbers between 3 and 53,

or multiples of 2,

or composite numbers,

or counting numbers,

or integers,

or rational numbers,

or real numbers,

or complex numbers,

etc.

Answer 3

• integers
• positive numbers
• natural numbers
• rational numbers
• multiples of 1.5
• multiples of 4.5
• multiples of 2
• multiples of 3
• multiples of 6
• multiples of 9
• multiples of 18
• even numbers
• multiples of perfect squares