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1. Formulas:-

2. 0, 1, 2, 3, ----9. are called digits.

3. 10, 11, 12,----- are called Number.

4. Natural number (N) :- Counting numbers are called natural numbers.

Eam!le:- 1, 2, 3,---etc. are all natural numbers. minimum natural number 1 and maimum natural

number "

5. #$ole numbers (#) :- %ll counting numbers toget$er &it$ 'ero rom t$e set o &$ole numbers

Eam!le:- 0, 1, 2, 3, , ------ are &$ole number.

6. *ntegers (+) :- %ll counting numbers, 0 and -e o counting numbers are called integers.

Eam!le:- -"---------, -3, -2, -1, 0, 1, 2, 3, -------"

7. ational Numbers () :- % ational Number is a real number t$at can be &ritten as a sim!le raction

Eam!le:- /!!,+

. *rrational N4mbers :- %n *rrational Number is a real number t$at cannot be &ritten as a

sim!le raction.

Eam!le:- 5

9. Een numbers :- % number diisible b6 2 is called an een number.

Eam!le:- 0, 2, , 7, - - - - - - - - -

10.8dd numbers :- % number not diisible b6 2 is called an odd number.

Eam!le:- 1, 3, , , - - - - - -

11.Com!osite Numbers :- Numbers greater t$an 1 &$ic$ are not !rime, are called com!osite numbers.

Eam!le:- , 7, , 9, 10, - - - -. 7 -; 1,2,3,7.

12.CF is 1.

Eam!le:- (21, ), (, 9), (2, 3), - - - - -

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14.=&in !rime numbers :- % !air o !rime numbers (as 3 and or 11 and 13) diering b6 t&o are

called t&in !rime number.

Eam!le:- =$e t&in !air !rimes bet&een 1 and 100 are

(3, ), (, ), (11, 13), (1, 19), (29, 31), (1, 3), (9, 71), (1, 3).

15.Face alue:- Face alue is t$e actual alue o t$e digit.

Eam!le:- *n t$e number 73, t$e ?? $as a ace alue o , t$e ace alue o 3 is 3 and so on17.