What is Number System?
A number system is a system for representing or expressing numbers of a certain type. We can define it as a writing system to express a number. Number system class 9 notes is provided here to help students understand the concepts more effectively.
Types of Number System
- Binary Number System
- Decimal Number System
Classification of Number System
Real numbers are numbers which are used to represent the actual physical quantities like height, length, density, weight, etc, in a meaningful figure.
Rational numbers are numbers which we can write as a fraction and where the numerator and denominator of the fraction are both whole numbers.
Irrational numbers are numbers which cannot be written as a simple fraction and it cannot be expressed as a ratio between two numbers. An irrational number can be written as a decimal, but not as a fraction.
The set of positive numbers is called as natural numbers.
Whole numbers are the set of all natural numbers including 0.
The set of all whole numbers along with negative numbers is called as integers.
Q.1) Classify the following numbers as rational or irrational.
Q.2) Simplify each of the following expressions:
Q.3) Add the following.
Q.4) Find 3 different irrational numbers between the rational numbers 5/7 and 9/11 .
Q.5) Classify the following numbers as rational or irrational:
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