Class 9th , Ex - 1.3, Q - 5, 6, 7, ( NUMBER SYSTEM ) CBSE NCERT

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Class: 9
Subject: Mathematics
Topic Name: Number System
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Natural Numbers
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All the numbers starting from 1 till infinity are natural numbers, such as 1,2,3,4,5,6,7,8,…….infinity. These numbers lie on the right side of the number line and are positive.
Whole Numbers
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All the numbers starting from 0 till infinity are whole numbers such as 0,1,2,3,4,5,6,7,8,9,…..infinity. These numbers lie on the right side of the number line from 0 and are positive.
Integers
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Integers are the whole numbers that can be positive, negative or zero.
Example: 2, 33, 0, -67 are integers.
Rational Numbers
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A number that can be represented in the form of p/q is called a rational number. For example, 1/2, 4/5, 26/8, etc.
Irrational Numbers
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A number is called an irrational number if it can’t be represented in the form of ratio.
Example: √3, √5, √11, etc.
Real Numbers
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The collection of all rational and irrational numbers is called real numbers. Real numbers are denoted by R.
Every real number is a unique point on the number line and also every point on the number line represents a unique real number.
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