NCERT Solutions for Class 9 Maths Chapter 1 Number Systems in Hindi Medium and English medium PDF form to free download. Solutions are updated according to Latest CBSE Syllabus 2018-19 for the students of CBSE Board as well as UP Board following NCERT Books for their final exam March 2019.

## NCERT Solutions for Class 9 Maths Chapter 1

**Go Back to NCERT Solutions for Class 9 Maths Main Page**

### Class 9 Maths Chapter 1 Number Systems

#### Solutions in Hindi Medium and English Medium

- Class 9 Maths Chapter 1 Exercise 1.1 Solutions
- Class 9 Maths Chapter 1 Exercise 1.2 Solutions
- Class 9 Maths Chapter 1 Exercise 1.3 Solutions

- Class 9 Maths Chapter 1 Exercise 1.4 Solutions
- Class 9 Maths Chapter 1 Exercise 1.5 Solutions
- Class 9 Maths Chapter 1 Exercise 1.6 Solutions
**NCERT Books for Class 9 All Subjects****NCERT Exemplar Problems Solutions****Study Material for 2018-2019 – English Medium****Study Material for 2018-2019 – Hindi Medium**

##### More about Number Systems

- Natural numbers are those numbers which are used for counting.
- Whole numbers are the collection of all natural numbers together with zero.
- Integers are the collection of all whole numbers and negative of natural numbers.
- Rational numbers are those numbers which can be expressed in the form of p/q, where p, q are integers and q is not equal to 0.
- Irrational numbers are those numbers which cannot be expressed in the form of p/q, where p, q are integers and q is not = 0.
- Real numbers are the collection of all rational and irrational numbers.

- Two numbers are said to be equivalent, if numerators and denominators of both are in proportion or they are reducible to be equal.
- The decimal expansion of real numbers can be terminating or non-terminating repeating or non-terminating non-repeating.
- The decimal expansion of rational numbers can either be terminating or non-terminating and vice-versa.
- The decimal expansion of irrational numbers can either be non-recurring and vice-versa.

- If ‘a’ is a rational and ‘b’ is an irrational, then a + b and a – b are irrational, and ab and a/b are irrational numbers, where b is not equal to 0.
- If ‘a’ and ‘b’ both are irrational, then a+b, a-b, ab and a/b may be rational or irrational.
- If ‘a’ be any real number and ‘n’ be any positive integer such that a^1/n = n√a is a real number, then ‘n’ is called exponent, ‘a’ is called radical and ‘√’ is called radical sign.

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