Math Question: Horcruxes

[steven1965aaa]

No: HPFGUIDX 152665

According to Prof. Slughorn you make a Horcrux by "splitting" your 
soul.  So Riddle makes his 1st Horcrux.  Now 50% of his soul is in 
horcrux #1 and 50% remains in his body.  

When Riddle makes the 2nd Horcrux, what is split?  The soul piece 
which remained in his body after he made the 1st Horcrux?  If so, that 
50% soul piece is now split, so Horcrux #3 contains 25% of his soul 
and Voldmort retains 25% in his body.  When he makes Horcrux #4 that 
25% would again be split so that Voldemort retains 12.5% of his 
original soul and 12.5% is transferred to Horcrux #4.  Extrapolating 
to the finish, Horcrux 6 would contain 3.125% of Voldemort's original 
soul and Voldemort is now left with only 3.125% of his original soul 
residing inside his body.

Is that the way it works?  Is my thinking on this too linear and 
not "magical" enough?  Does this matter?  Questions/comments/theories?

Steven1965aaa