Mathematics for Standard IX

Chapter no. 1 Number System
Today we are going to learn the most important content from chapter 1 of your Mathematics textbook .
So kindly note down the following terms while watching video from given link.
Types of Numbers:-
1) Natural numbers- (Counting numbers )
1,2,3,..............upto infinite
2) Whole number -  0,1,2,3,..........upto infinite
3) Integers- ...........-3,-2,-1,0,1,2,3,.........
All natural numbers and their negative including 0 are called integers and it is denoted by Z.
4) Rational numbers- If the number which can be expressed in p/q form where both p and q are integers and q not equal to zero then it is called Rational numbers. It is denoted by Q.
e.g 2/3  , -3/5,  -7 etc.
5) Irrational numbers- It is defined in two ways
i) Non-perfect square number present in square root symbol are called Irrational number.
ii) Non-terminating and non-recurring decimal form are called Irrational number.
Now watch the video
The video of types of numbers are available in following link.
TYPES OF NUMBERS
The video of solutions of Exercise 1.1are available in following link Solutions of Exercise 1.1
Assignment (Other examples for practice)