Q22. - Algebra 2

Question

Name the sets of numbers to which each number belongs.

$-4.55$

Step-by-Step Solution

Answer

$-4.55$ belongs to the sets of rational number and real number.

Step 1 - Define different sets

• The set $\left\{1,2,3,4,5,...\right\}$ is called the set of natural number.
• The set $\left\{0,1,2,3,4,5,...\right\}$ is called the set of whole number.
• The set $\left\{-3,-2,-1,0,1,2,3,...\right\}$ is called the set of integer number.
• The set of rational number has numbers in the ratio form $\frac{m}{n}$, where m and n are integers and n is non-zero. The decimal form of a rational number is either a terminating or repeating decimal.
• A real number that is not rational is irrational. The decimal form of an irrational number is neither terminating nor rational.
• Combine sets of rational and irrational number is real number.

Step 2 - Relationship between different sets

Following venn diagram shows relationship between different sets

Where, the symbols denote 

N- Natural number

W- Whole number

Z- Integers

Q- Rational number

I- Irrational number

R- Real numbers

Step 3 - Find the sets to which - 4 . 55 belongs

As, $-4.55$  has a terminating decimal representation which implies it is a rational number.

So, using above venn diagram, $-4.55$  a rational number and a real number.

Thus, $-4.55$  belongs to the sets of rational number and real number.