# NCERT Solutions for Class 9 Maths Chapter 1 Number Systems Ex 1.1

NCERT Solutions for Class 9 Maths Chapter 1 Number Systems Ex 1.1 are part of NCERT Solutions for Class 9 Maths. Here we have given NCERT Solutions for Class 9 Maths Chapter 1 Number Systems Ex 1.1.

• Number Systems Class 9 Ex 1.1
• Number Systems Class 9 Ex 1.2
• Number Systems Class 9 Ex 1.3
• Number Systems Class 9 Ex 1.4
• Number Systems Class 9 Ex 1.5
• Number Systems Class 9 Ex 1.6

## NCERT Solutions for Class 9 Maths Chapter 1 Number Systems Ex 1.1

Ex 1.1 Class 9 Maths Question 1.
Is zero a rational number? Can you write it in the form $\cfrac { P }{ q }$, where p and q are integers and q ≠ 0?
Solution:
Yes, zero is a rational number.
Zero can be written in any of the following forms :
$\cfrac { 0 }{ 1 } ,\cfrac { 0 }{ -1 } ,\cfrac { 0 }{ 2 } \cfrac { 0 }{ -2 }$
Thus, 0 can be written as $\cfrac { P }{ q }$, where p = 0 and q is any non-zero integer.
Hence, 0 is a rational number.

Ex 1.1 Class 9 Maths Question 2.
Find six rational numbers between 3 and 4.
Solution:
The rational numbers between 3 and 4.

Ex 1.1 Class 9 Maths Question 3.
Find five rational numbers between $\cfrac { 3 }{ 5 }$ and $\cfrac { 4 }{ 5 }$.
Solution:
Since we want 5 rational numbers between $\cfrac { 3 }{ 5 }$ and $\cfrac { 4 }{ 5 }$, so we write

Ex 1.1 Class 9 Maths Question 4.
State whether the following statements are true or false. Give reasons for your answers.

1. Every natural number is a whole number.
2. Every integer is a whole number.
3. Every rational number is a whole number.

Solution:
(1) True: Every natural number lies in the collection of whole numbers.
(2) False: -3 is not a whole number.
(3) False: $\cfrac { 3 }{ 5 }$  is not a whole number.

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