#### Chapters

Chapter 2: Exponents of Real Numbers

Chapter 3: Rationalisation

Chapter 4: Algebraic Identities

Chapter 5: Factorisation of Algebraic Expressions

Chapter 6: Factorisation of Polynomials

Chapter 7: Introduction to Euclid’s Geometry

Chapter 8: Lines and Angles

Chapter 9: Triangle and its Angles

Chapter 10: Congruent Triangles

Chapter 11: Co-ordinate Geometry

Chapter 12: Heron’s Formula

Chapter 13: Linear Equations in Two Variables

Chapter 14: Quadrilaterals

Chapter 15: Areas of Parallelograms and Triangles

Chapter 16: Circles

Chapter 17: Constructions

Chapter 18: Surface Areas and Volume of a Cuboid and Cube

Chapter 19: Surface Areas and Volume of a Circular Cylinder

Chapter 20: Surface Areas and Volume of A Right Circular Cone

Chapter 21: Surface Areas and Volume of a Sphere

Chapter 22: Tabular Representation of Statistical Data

Chapter 23: Graphical Representation of Statistical Data

Chapter 24: Measures of Central Tendency

Chapter 25: Probability

#### RD Sharma Mathematics Class 9 by R D Sharma (2018-19 Session)

## Chapter 1 : Number Systems

#### Page 5

Is zero a rational number? Can you write it in the form p/q, where p and q are integersand q ≠ 0?

Find five rational numbers between 1 and 2.

Find six rational numbers between 3 and 4.

Find five rational numbers between 3/5 and 4/5.

State whether the following statement is true or false. Give reasons for your answers.

Every whole number is a natural number.

State whether the following statement is true or false. Give reasons for your answers.

Every integer is a rational number.

State whether the following statement is true or false. Give reasons for your answers.

Every rational number is an integer.

State whether the following statement is true or false. Give reasons for your answers.

Every natural number is a whole number.

State whether the following statement is true or false. Give reasons for your answers.

Every integer is a whole number.

State whether the following statement is true or false. Give reasons for your answers.

Every rational number is a whole number.

#### Pages 0 - 15

Express the following rational number as decimal:

`42/100`

Express the following rational number as decimal:

`327/500`

Express the following rational number as decimal:

`15/4`

Assuming that x, y, z are positive real numbers, simplify the following:

`root5(243x^10y^5z^10)`

Express the following rational number as decimal:

`2/3`

Express the following rational number as decimal:

`-4/9`

Express the following rational number as decimal:

`-2/15`

Express the following rational number as decimal:

`-22/13`

Express the following rational number as decimal:

`437/999`

Express the following rational number as decimal:

`33/26`

Look at several examples of rational numbers in the form p/q (q≠0), where p and q are integers with no common factors other than 1 and having terminating decimal representations (expansions). Can you guess what property q must satisfy?

Simplify `(3sqrt2 - 2sqrt3)/(3sqrt2 + 2sqrt3) + sqrt12/(sqrt3 - sqrt2)`

#### Page 22

Express the following decimal in the form `p/q` : 0.39

Express the following decimal in the form `p/q` : 0.750

Express the following decimal in the form `p/q` : 2.15

Express the following decimal in the form `p/q`:

7.010

Express the following decimal in the form `p/q`: 9.90

Express the following decimal in the form `p/q`: 1.0001

Express the following decimal in the form `p/q`: `0.bar4`

Express the following decimal in the form `p/q`: `0.bar37`

Express the following decimal in the form `p/q`: `0.bar54`

Express the following decimal in the form `p/q`: `0.bar621`

Express the following decimal in the form `p/q`: `125.bar3`

Express the following decimal in the form `p/q`: `4.bar7`

Express the following decimal in the form `p/q`: `0.4bar7`

#### Pages 30 - 31

Define an irrational number ?

Explain, how irrational numbers differ from rational numbers ?

Examine, whether the following number are rational or irrational:

`sqrt7`

Examine, whether the following number are rational or irrational:

`sqrt4`

Examine, whether the following number are rational or irrational:

`2+sqrt3`

Examine, whether the following number are rational or irrational:

`sqrt3+sqrt2`

Examine, whether the following number are rational or irrational:

`sqrt3+sqrt5`

Examine, whether the following number are rational or irrational:

`(sqrt2-2)^2`

Examine, whether the following number are rational or irrational:

`(2-sqrt2)(2+sqrt2)`

Examine, whether the following number are rational or irrational:

`(sqrt2+sqrt3)^2`

Examine, whether the following number are rational or irrational:

`sqrt5-2`

Classify the following number as rational or irrational :-

`sqrt23`

Classify the following number as rational or irrational :-

`sqrt225`

Classify the following number as rational or irrational :-

0.3796

Classify the following number as rational or irrational :-

7.478478...

Classify the following number as rational or irrational :-

1.1010010001...

Identify the following as rational or irrational number. Give the decimal representation of rational number:

`sqrt4`

Identify the following as rational or irrational number. Give the decimal representation of rational number:

`3sqrt18`

Identify the following as rational or irrational number. Give the decimal representation of rational number:

`sqrt1.44`

`sqrt(9/27)`

`-sqrt64`

`sqrt100`

In the following equation, find which variables *x, y, z* etc. represent rational or irrational number:

x^{2} = 5

In the following equation, find which variables *x, y, z* etc. represent rational or irrational number:

y^{2} = 9

In the following equation, find which variables *x, y, z* etc. represent rational or irrational number:

z^{2} = 0.04

*x, y, z* etc. represent rational or irrational number:

`u^2=17/4`

*x, y, z* etc. represent rational or irrational number:

v^{2} = 3

*x, y, z* etc. represent rational or irrational number:

w^{2} = 27

*x, y, z* etc. represent rational or irrational number:

t^{2} = 0.4

Give two rational numbers lying between 0.232332333233332... and 0.212112111211112.

Give two rational numbers lying between 0.515115111511115... and 0.535335333533335...

Find one irrational number between 0.2101 and 0.222... = `0.bar2`

Find a rational number and also an irrational number lying between the numbers 0.3030030003... and 0.3010010001...

Find three different irrational numbers between the rational numbers `5/7" and "9/11.`

Give an example of two irrational numbers whose:

difference is a rational number.

Give an example of two irrational numbers whose:

difference is an irrational number.

Give an example of two irrational numbers whose:

sum is a rational number.

Give an example of two irrational numbers whose:

sum is an irrational number.

Give an example of two irrational numbers whose:

product is an rational number.

Give an example of two irrational numbers whose:

product is an irrational number.

Give an example of two irrational numbers whose:

quotient is a rational number.

Give an example of two irrational numbers whose:

quotient is an irrational number.

Find two irrational numbers between 0.5 and 0.55.

Find two irrational numbers lying between 0.1 and 0.12.

Prove that `sqrt3+sqrt5` is an irrational number.

#### Pages 35 - 36

Complete the following sentence:

Every point on the number line corresponds to a _________ number which many be either _______ or ________.

Complete the following sentence:

The decimal form of an irrational number is neither ________ nor _________

Complete the following sentence:

The decimal representation of a rational number is either ______ or _________.

Complete the following sentence:

Every real number is either ______ number or _______ number.

Find whether the following statement is true or false.

Every real number is either rational or irrational.

Find whether the following statement is true or false.

π is an irrational number.

Find whether the following statement is true or false.

Irrational numbers cannot be represented by points on the number line.

Represent `sqrt6,` `sqrt7,` `sqrt8` on the number line.

Represent `sqrt3.5,` `sqrt9.4,` `sqrt10.5` on the real number line.

#### Page 39

Visualise 2.665 on the number line, using successive magnification.

Visualise the representation of `5.3bar7` on the number line upto 5 decimal places, that is upto 5.37777.

#### RD Sharma Mathematics Class 9 by R D Sharma (2018-19 Session)

#### Textbook solutions for Class 9

## RD Sharma solutions for Class 9 Mathematics chapter 1 - Number Systems

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