PPT: Number System (A bit iffy) | 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
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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
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.
Whole numbers
Example: W = {0, 1, 2, 3, 4 ... .}
Whole numbers are represented on number line as follows:
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.
Whole numbers
Example: W = {0, 1, 2, 3, 4 ... .}
Whole numbers are represented on number line as follows:
The collection of all whole numbers and negatives of all natural
numbers or counting numbers are called integers. 
In t e ge rs
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 ... . .}