Chapter 0.2, Problem 8E

To determine

The set or sets of numbers to which real number $\frac{18}{3}$ belong.

Answer to Problem 8E

The real number $\frac{18}{3}$ is a natural number, whole number, integer and rational number.

Explanation of Solution

Given information:

The real number $\frac{18}{3}$ .

Formula used:

Real numbers are categorized as follows:

Natural number are the positive numbers (integer) which start from 1.

Whole number are positive numbers which start from 0.

Integers are numbers which is not a fraction (whole number).

Rational numbers are number which are in the form of $\frac{p}{q}$ where p and q are integers, $q\ne 0$ .

Irrational numbers are those number which cannot be expressed in the form of $\frac{p}{q}$ where $q\ne 0$ .

Calculation:

Consider the providedreal number $\frac{18}{3}$ .

Rewrite it as,

  $\begin{array}{c}\frac{18}{3}=\frac{6\times 3}{3}\\ =6\\ =\frac{6}{1}\end{array}$

Recall that real numbers are categorized as follows:

Natural number are the positive numbers (integer) which start from 1.

Therefore, it is a natural number.

Whole number are positive numbers which start from 0.

Therefore, it is a whole number.

Integers are numbers which is not a fraction (whole number).

Therefore it is an integer.

Rational numbers are number which are in the form of $\frac{p}{q}$ where p and q are integers, $q\ne 0$ .

Therefore, it is a rational number.

Irrational numbers are those number which cannot be expressed in the form of $\frac{p}{q}$ where $q\ne 0$ .

Therefore, it is not an irrational number.

Thus, the real number $\frac{18}{3}$ is a natural number, whole number, integer and rational number.