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Types of Numbers
1. Natural Numbers :-
This numbers includes digits 1,2,3,4,5,6,7,8,9
Important point is here Negative digits and zero (0) is not part of natural numbers
2. Whole Numbers :-
It includes 0,1,2,3,4,5,6,7,8,9
It means Whole Number is Natural numbers including zero (0) or we can say
Whole Number = zero (0) + All Natural Number
3. Integers :-
It includes all negative number ( -1, -2, -3, -4, -5, -6, -7, -8, -9 ), zero (0) and natural number ( 1,2,3,5,6,7,8,9 )
It is also divided into three parts
A) Positive Integers : 1,2,3,4,5....
B) Negative Integers : -1, -2, -3, -4, -5.....
C) Non-Positive & Non-Negative Integers : 0
So zero (0) is neither Positive nor Negative number. So it includes in both sets of numbers Positive or Negative.
non-negative integers : { 0, 1, 2, 3, 4, 5..... }
Positive integers : { 0, -1, -2, -3, -4, -5 ....}
4. Even numbers :-
Number which is divisible by 2 means if we divide any number by 2 reminder must be 0 that number is called even number.
Example if divide 8/2 = 4 and reminder 0 so it is even numbers
5. Odd numbers :-
It is similar to Even number if number is not divided by two that numbers called odd number. Means if reminder will be equal to 1
Example 7/2 = 3 with reminder 1 So it is odd numbers
6. Prime Numbers :-
Number greater than 1 and it is divisible by only 1 and number it self. Such number is not complete divisible by any other number.
Some Prime Numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37....
7. composite Numbers :-
Numbers greater than 1 and not prime number are called composite numbers.
Example : 4, 6, 8, 9, 10, 12, 14, 15, 16....
8. Co-primes :
two numbers which H.C.F ( Highest Common Factor ) is 1 called co-prime numbers.
Example (2,3)
(4,5),
(8,11)