Natural numbers start at 1 and increase infinitely, while whole numbers include zero. Even numbers are divisible by 2, with units places of 0, 2, 4, 6 or 8, and odd numbers are not divisible by 2, with units places of 1, 3, 5, 7, or 9. Prime numbers are divisible only by 1 and themselves, with some examples listed being 2, 3, 5, 7, 11, 13, 17 and so on.

2.  Natural number
 Whole number
 Even number
 Odd number
 Prime number

3. • Numbers that start from
1,2,3,4,5…..so one are called
natural numbers . “zero” is not a
natural number. So 1, is the
smallest natural number.

4. •All natural numbers and
zero together
0,1,2,3,4,5…….so on are
called whole numbers.
Zero is the smallest whole
number

5. • A counting number which is
exactly divisible by 2 is
called an even
• For example:-
0,2,4,6,8,10,12…..etc.
Every unit place of an even
number will be 0,2,,6,8.
.

6. • A counting number which is
not divisible by 2 is called an
odd number
• For example:-
1,3,5,7,9,11……etc.
• Every unit place of an odd
number will be 1,3,5,7,9.

7. • A counting number is called a
prime number when it is
divisible only by “1” and itself
• Numbers are:-
2,3,5,7,11,13,17,19,23,29,37
,41,43,47,53,59,61,67,71,73,79
,83,89,97.

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