Number System

• How number is made

25	=	2	5
	=	20*10 + 5
	=	25
	
xy	=	10x+y
yx	=	10+x
	
679	=	
face value of 7 is 7
Place value of 7 is 10*7=70 

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Natural No

• 1,2,3 .... infinity

Whole No

• 0,1,2,3 ... infinity

Integer

• infinity ... -3,-2,-1,0,1,2,3...infinity

• 4.8 is not a integer

• so the integer value of 4.8 is 5.

Prime No

• The number is divisible by itself and 1.

• 2,3,5...

• 1 to 100- 25 prime no

• Three digit smallest prime no 101

Composite Number

• The number which are not prime they are composite number

Co-prime number

• If the HCF of two number become 1 then they are co-prime

• eg (8,15)

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Compiled by Shreeshail Vitkar

Feel free to fork @ C-dac Notes

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