Decimal (Base 10) 
Binary (Base 2) 
Octal (Base 8) 
Hexadecimal (Base 16) 


Digits:  0  9  0  1  0  7  0  9, A  F 
How many numbers can be represented with one digit?  10  2  8  16 
Largest number represented with one digit?  9  1  7  F (15_{10}) 
What's the next number?  10  10_{2} ( = 2_{10})  10_{8}  10_{16} 
Largest number represented with two digits?  99  11_{2} ( = 3_{10})  77_{8}  FF_{16} 
What's the next number?  100  100_{2} ( = 4_{10})  100_{8}  100_{16} 
What's the representation for 4394_{10}?  4394  1000100101010  10452  112A 
1 000 100 101 010  1 0001 0010 1010 