PPT: Number System | Mathematics (Maths) Class 9 PDF Download

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Number System
Number system is a writing system used for expressing the
numbers. A number is a mathematical object used to count,
label and measure.
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1 1
4 4
9 9
6 6
3 3
7 7
5 5
2 2
0 0
8 8
Number System
Number system is a writing system used for expressing the
numbers. A number is a mathematical object used to count,
label and measure.
Types of Numbers
1 1
3 3
4 4
9 9
7 7
5 5
2 2
0 0
6 6
8 8
Page 3


1 1
4 4
9 9
6 6
3 3
7 7
5 5
2 2
0 0
8 8
Number System
Number system is a writing system used for expressing the
numbers. A number is a mathematical object used to count,
label and measure.
Types of Numbers
1 1
3 3
4 4
9 9
7 7
5 5
2 2
0 0
6 6
8 8
All counting numbers are called natural numbers. It is denoted
by “N”.
Example: N = {1, 2, 3, 4 ... .}
Natural numbers are represented on the number line as
follows:
Natural numbers
Page 4


1 1
4 4
9 9
6 6
3 3
7 7
5 5
2 2
0 0
8 8
Number System
Number system is a writing system used for expressing the
numbers. A number is a mathematical object used to count,
label and measure.
Types of Numbers
1 1
3 3
4 4
9 9
7 7
5 5
2 2
0 0
6 6
8 8
All counting numbers are called natural numbers. It is denoted
by “N”.
Example: N = {1, 2, 3, 4 ... .}
Natural numbers are represented on the number line as
follows:
Natural numbers
The group of natural numbers including zero is called whole
numbers. It is denoted by “W”. All natural numbers are called whole
numbers.
Example: W = {0, 1, 2, 3, 4 ... .}
Whole numbers are represented on number line as follows:
Whole numbers
Page 5


1 1
4 4
9 9
6 6
3 3
7 7
5 5
2 2
0 0
8 8
Number System
Number system is a writing system used for expressing the
numbers. A number is a mathematical object used to count,
label and measure.
Types of Numbers
1 1
3 3
4 4
9 9
7 7
5 5
2 2
0 0
6 6
8 8
All counting numbers are called natural numbers. It is denoted
by “N”.
Example: N = {1, 2, 3, 4 ... .}
Natural numbers are represented on the number line as
follows:
Natural numbers
The group of natural numbers including zero is called whole
numbers. It is denoted by “W”. All natural numbers are called whole
numbers.
Example: W = {0, 1, 2, 3, 4 ... .}
Whole numbers are represented on number line as follows:
Whole numbers
The collection of all whole numbers and negatives of all natural
numbers or counting numbers are called integers. They are
denoted by “Z” or “I”. All whole numbers are integers, but all
integers are not whole numbers
Example: Z or I = {... - 3, -2, -1, 0, 1, 2, 3 ... . .}
In t e ge rs