NCERT Books for Class 9 Maths Chapter 1

Students can download it from Vedantu. On this page, Students can download Class 9 Maths Chapter-1 PDF Solutions of the Book.

‘Number systems’ is the first chapter in the NCERT Maths textbooks for Class 9 students. In this chapter, students learn many concepts that are very important and build a foundation for the upcoming chapters. It begins with an introduction of the number line as well the different kinds of numbers on it such as natural numbers, whole numbers, integers and rational numbers. Students will get to learn how these numbers are denoted.  It is followed up by two other important topics on irrational numbers and real numbers.

A number is said to be irrational if it cannot be expressed in a ratio (p/q) where p and q are integers and q is not equal to 0. Further, students will learn about decimal expansions of real numbers and check whether it helps while differentiating between rational and irrational numbers; how to represent real numbers on the number line. They also learn about performing operations like addition, subtraction, multiplication, and division on irrational numbers. In the final section, students will learn about the laws of exponents for real numbers. 

Sections of Chapter 1- Number Systems

1.1 Introduction

1.2 Irrational Numbers

1.3 Real Numbers and their Decimal Expansions

1.4 Representing Real Numbers on the Number Line.

1.5 Operations on Real Numbers

1.6 Laws of Exponents for Real Numbers

1.7 Summary

List of Exercises in Chapter 1- Number Systems

Exercise 1.1 - 4 questions

Exercise 1.2- 4 questions

Exercise 1.3- 9 questions

Exercise 1.4- 2 questions

Exercise 1.5- 5 questions

Exercise 1.6- 3 questions

 Advantages of referring to NCERT book for Class 9 Maths

The National Council of Educational Research and Training (NCERT), an autonomous organization, is known for designing textbooks for the primary as well as secondary levels. Let’s look at some of the features which distinguish NCERT textbooks from other books.

• The NCERT textbooks have numerous illustrations that make the textbook very interesting to study.

• After every concept is introduced, there are solved examples that solidify the concept in a student’s mind and add to their understanding.

• NCERT textbooks give students loads of practice as there is an exercise with different kinds of questions for every section in the chapter.

• These books are designed by subject matter experts and carefully researched. 

• These books are very easy to follow. Each concept is explained in detail and followed with solved examples and exercises.

• NCERT textbooks adhere to the CBSE syllabus and are prescribed by CBSE themselves.

• These books are more than enough for preparing for the class 9 exam and are also used to prepare for competitive exams like JEE and NEET.

• NCERT Maths textbooks have a chapter summary in the end that is very helpful during revision.