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

Mathematics is undoubtedly an indispensable part of the prescribed ICSE academic curriculum for Class 9. Mathematics is a vital academic discipline. Students must ensure that they are thorough with the formulasand types of questions listed in their prescribed ICSE book in accordance with the latest ISC & ICSE Syllabus. They must also diligently seek appropriate guidance from their teachers to achieve the necessary conceptual clarity with regard to the topics at hand. It is also highly recommended that students also include regular practise of the questions contained in the ICSE Question Paper of past years and in reliable and comprehensive ICSE Sample Question Papers in order to familiarise themselves with the conventional examination pattern.Consistent practise and revision with the aid of the ICSE Class 9 Mathematics Revision Notes Chapter 1 would also be greatly helpful to students who face difficulties managing their time during examinations.The academic curriculum for Mathematics in Class 9 9 consists of 28 distinct chapters.The first chapter is titled Rational and Irrational Numbers. It is a lengthy and detailed chapter comprising  of many important formulas and engaging calculations. The ICSE Class 9 Mathematics Revision Notes Chapter 1 would play the role of crucial descriptive guidelines for students in acquiring a holistic, comprehensive, and conceptually clear understanding of the topic- Rational and Irrational Numbers.

The Extramarks website provides non-complicated, descriptive, and easy-to-understand ICSE Class 9 Mathematics Revision Notes Chapter 1 to supplement  the sincere efforts  of students. These have been compiled with reference to the contributions made by Extramarks experienced  subject experts to ensure easy access to great quality content. The ICSE Class 9 Mathematics Revision Notes Chapter 1 have a logically-structured summary of the designated text and are inclusive of all crucial details. This will also ensure that students are well-prepared to answer ICSE Important Questions during examinations. The ICSE Revision Notes for Chapter 1 can be used s as reference material by students.

## Revision Notes for ICSE Class 9 Mathematics Chapter 1- Free PDF Download

Twenty-eight chapters constitute the prescribed ICSE book for Class 9 mathematics. Chapter 1- Rational and Irrational Numbers consists of explanations of what are rational and irrational numbers, the definitions of real and imaginary numbers, and the kinds of calculations that are possible between rational and irrational numbers. These major themes have multiple underlying details, which have to be retained through constant practise of the ICSE Class 9 Mathematics Revision Notes Chapter 1 like formulae, the steps involved in a logically sequenced calculation, etc.The latter can only be perfected through continuous revision and practise so that one is adequately prepared to efficiently answer these questions during examinations. These notes have been compiled with careful consideration of the inclusion of these important elements of the chapter. These notes have been organised into bullet points for ease of understanding and ease of retention. Important formulas have been highlighted separately.Extramarks is sincerely committed to provinding  well-structured and holistically comprehensive ICSE Class 9 Mathematics Revision Notes Chapter 1 which can act as a complete solution  for students in their exam preparation. Students can easily bank on these notes to speed up their preparation without missing out

### Rational and Irrational Numbers

on a single topic. . The Extramarks website provides the ICSE Class 9 Mathematics Revision Notes Chapter 1 PDF Download option  to ensure easier and more efficient access to quality content.

In Mathematics, rational numbers can be defined as a type of real numbers. These numbers can be represented in the form of p/q where q is not equal to zero. Few  examples of rational numbers can be listed as follows- 1/2, 3/4, ¼. The number zero is also a rational number since it can be represented in many forms such as 0/1, 0/2, 0/3, 0/4. Irrational numbers can be defined as those numbers that cannot be effectively represented as single fractions. These numbers cannot be depicted in the form of ratios, or as p/q where q is not equal to zero. Rational and irrational numbers are collectively referred to as Real Numbers within the number system. The number system along with  details of the calculations involving the different types of numbers have been compiled in the ICSE Class 9 Mathematics Revision Notes Chapter 1.

Extramarks provides the ICSE Class 9 Mathematics Revision Notes Chapter 1 which are well explained  and easy to grasp. These notes include  definitions, easy explanations of formulae, and  examples, which make it easier for students to grasp crucial points. The ICSE Class 9 Mathematics Revision Notes Chapter 1 have also been arranged in the bullet-point format in order to make it more convenient for memory retention purposes.