NCERT Solutions for Class 9 Maths Exercise 1.1

NCERT Solutions for Class 9 Maths Exercise 1.1 book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 9 Maths chapter wise NCERT solution for Maths Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.

NCERT solutions for Class 9 Maths Number Systems Download as PDF

NCERT Solutions for Class 9 Maths Number Systems

1. Is zero a rational number? Can you write it in the form, where p and q are integers and?

Ans. Consider the definition of a rational number.

A rational number is the one that can be written in the form of, where p and q are integers and.

Zero can be written as.

So, we arrive at the conclusion that 0 can be written in the form of, where q is any integer.

Therefore, zero is a rational number.

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NCERT Solutions for Class 9 Maths Exercise 1.1

2. Find six rational numbers between 3 and 4.

Ans. We know that there are infinite rational numbers between any two numbers.

A rational number is the one that can be written in the form of, where p and q are

Integers and .

We know that the numbers all lie between 3 and 4.

We need to rewrite the numbers in form to get the rational numbers between 3 and 4.

So, after converting, we get.

We can further convert the rational numbers into lowest fractions.

On converting the fractions into lowest fractions, we get.

Therefore, six rational numbers between 3 and 4 are.

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NCERT Solutions for Class 9 Maths Exercise 1.1

3. Find five rational numbers between.

Ans. We know that there are infinite rational numbers between any two numbers.

A rational number is the one that can be written in the form of, where p and q are

Integers and.

We know that the numbers can also be written as.

We can conclude that the numbers all lie between

We need to rewrite the numbers in form to get the rational numbers between 3 and 4.

So, after converting, we get.

We can further convert the rational numbers into lowest fractions.

On converting the fractions, we get.

Therefore, six rational numbers between 3 and 4 are.

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NCERT Solutions for Class 9 Maths Exercise 1.1

4. State whether the following statements are true or false. Give reasons for your answers.

(i) Every natural number is a whole number.

(ii) Every integer is a whole number.

(iii) Every rational number is a whole number.

Ans. (i) Consider the whole numbers and natural numbers separately.

We know that whole number series is.

We know that natural number series is.

So, we can conclude that every number of the natural number series lie in the whole number series.

Therefore, we conclude that, yes every natural number is a whole number.

(ii) Consider the integers and whole numbers separately.

We know that integers are those numbers that can be written in the form of, where.

Now, considering the series of integers, we have.

We know that whole number series is.

We can conclude that all the numbers of whole number series lie in the series of integers. But every number of series of integers does not appear in the whole number series.

Therefore, we conclude that every integer is not a whole number.

(iii) Consider the rational numbers and whole numbers separately.

We know that rational numbers are the numbers that can be written in the form, where.

We know that whole number series is.

We know that every number of whole number series can be written in the form of as.

We conclude that every number of the whole number series is a rational number. But, every rational number does not appear in the whole number series.

Therefore, we conclude that every rational number is not a whole number.

NCERT Solutions for Class 9 Maths Exercise 1.1

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