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# ICSE Class 9 Maths Chapter 1 Rational and Irrational Numbers Revision Notes

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## ICSE Class 9 Maths Chapter 1 Rational and Irrational Numbers Revision Notes

Revision is very important for better conceptual understanding and securing good marks, and for Revision, Revision Notes are always considered the best. Students are always advised to prepare hand made notes because no notes are better than the ones that are prepared by themselves. However, if you didn’t prepare them then, and don’t have enough time now to prepare them yourself then you can go for premade Revision Notes.

We, at Swiflearn, provides you the best ICSE Class 9 Maths Chapter 1 Rational and Irrational Numbers Maths Revision Notes that students can use for their revision purpose. ICSE Class 9 Maths Chapter 1  Revision Notes can be very helpful for students to recall all their previously learned chapters and concepts quickly and conveniently, especially during exams when they have to revise the whole syllabus in a limited time period. ICSE Class 9 Maths Chapter 1  Revision Notes makes it convenient for the students to have an overview of the important concepts and points of ICSE Class 9 Maths Chapter 1 Rational and Irrational Numbers and hence, enhance the confidence among them.

ICSE Class 9 Maths Chapter 1 Rational and Irrational Numbers Revision Notes by Swiflearn are so far the best and most reliable Revision Notes for ICSE Class 9 Maths Chapter 1 . These ICSE Revision Notes for Class 9 Maths Chapter 1 Maths Chapter 1 Rational and Irrational Numbers are prepared by subject matter experts at Swiflearn to help the students to understand and revise the concepts right from the beginning. ## Natural numbers

The positive integers are called natural numbers.

#### Types on natural number:

Even Natural Numbers: If it is a multiple of two then it is called even natural number. … A value of the form 2n, where n is a counting number. e.g. 2, 4, 6, 8, 38…..

Odd Natural Numbers: An odd number is one which is not divisible by 2 and the first odd natural number is 1. e.g. 1, 3, 5, 7, 9…

Prime Numbers: These are the numbers that are exactly divisible by only 1 and the
number itself. e.g., 1, 3, 5, 7, 11, 13…

## Rational Numbers

Any number which can be put in the form of p/q where p and q are integers and q is not equal to zero, is called a rational number. There exist an infinite number of rational numbers between any two rational numbers.
For example, between 7 and 7.5 there exist 7.1, 7.11, 7.21, etc.

## Irrational Numbers

Those numbers which cannot be expressed in the form of p/q where p, q are integers, and q not equal to zero are called irrational numbers.
The sum, difference, product, or quotient of two irrational numbers may not be an
irrational number. The negative of an irrational number is also an irrational number.
Examples are 1.8632457…, √2, etc.

### ICSE Class 9 Maths Chapter 1 Rational and Irrational Number Revision Notes PDF 