Development Binary

I was wondering if anyone had any links to guides for binary as i wish to learn it For no real reason but for personal annoying my friends benefit.

 

http://nickciske.com/tools/binary.php

or
http://www.tekmom.com/buzzwords/binaryalphabet.html

 

Code:

8	4	2	1		Decimal

0	0	0	0		0
0	0	0	1		1
0	0	1	0		2
0	0	1	1		3
0	1	0	0		4
0	1	0	1		5
0	1	1	0		6
0	1	1	1		7
1	0	0	0		8
1	0	0	1		9
1	0	1	0		10
1	0	1	1		11
1	1	0	0		12
1	1	0	1		13
1	1	1	0		14
1	1	1	1		15

That should give you a rough idea of how binary works compaired to decimal.
It's similar to roman numerals, in that you add the binary values to get a decimal value.
ie take the binary value for 7 = 0111 that is (0x8)+(1x4)+(1x2)+(1x1)