Is 12V to 5V conversion possible while maintaining ratios?

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i'm not quite sure how explain i'm looking for, i'l try anyway.

the arduino (uno's) analog input can convert analog signal digital signal. however, see it's limitation it's anywhere 0-5v.

3.5v 70% of 5v, therefore digital equivalent somewhere close 716 (in range of 0 1023).
the 70% equivalent 12v 8.4v. if able map 12v 5v digital equivalent 716.

is possible or there device can convert 0-12v input 0-5v input it's usable arduino? there arduino measure varies between 0v , 12v.

i hope i've explained myself enough.
thanks in advance!

-miguel

quote
the arduino (uno's) analog input can convert analog signal digital signal  


really ? why don't post code demonstrating how ?


quote
is there device can convert 0-12v input 0-5v input it's usable arduino? 

http://www.fairchildsemi.com/ds/cd/cd4049ubc.pdf (output voltage level determined vcc voltage used. input can tolerate +12v input. in other words, if want convert 5v 12v, connect vcc 12v. if want convert 12v 5v, connect vcc 5v.


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