Introduction to Numbers

1. Math
Standard - 5
Lesson -1
(Numbers)
Numbers
Basic Introduction:
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2. Natural
Numbers
Natural Numbers
Natural Numbers are a part of the number system
which includes all the positive integers from 1 till
infinity and are also used for counting purpose. It does
not include zero (0).
In fact, 1,2,3,4,5,6,7,8,9…., are also
called counting numbers.
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3. Whole
Numbers
Whole Numbers
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The Whole Numbers are the numbers without fractions and it is a collection of
positive integers and zero.
The examples of integers are -4,-3,-2,-1,0,1,2,3,4,….etc.

4. Integer
Numbers
Integer Numbers
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integers are the numbers which can be positive, negative or zero, but
cannot be a fraction.
These numbers are used to perform various arithmetic operations,
•Addition
•Subtraction
•Multiplication and
•Division.
The examples of integers are -4,-3,-2,-1,0,1,2,3,4,….etc.

5. Prime
Numbers
Prime Numbers : 1,2,3,5,7,11…………..
Prime numbers are numbers that have only 2 factors, 1and themselves.
For example, 2, 3, 5, 7, and 11.
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6. Composite
Numbers
Composite Numbers :
The numbers which have more than two factors.
All the natural numbers which are not prime numbers are composite
numbers as they can be divided by more than two numbers.
For example, 6 is composite because it is divisible by 1, 2, 3 and even
6, such as:
6÷1 = 6
6÷2 = 3
6÷3 = 2
6÷6 = 1
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7. Even
Numbers
Even Numbers
Even Numbers are integers that are exactly divisible by 2,
For example, 2, 6, 10, 20, 50, …..etc,
2÷2 = 1
6÷2 = 3
10÷2 = 5
20÷2 = 10
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8. Odd
Numbers
Odd Numbers
An odd number cannot be exactly divided by 2.
For example, 3, 5, 7, 9, 5,11, …..etc,
3÷2 = 1.5
5÷2 = 2.5
7÷2 = 3.5
9÷2 = 4.5
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