Yes.
Because six of anything is greater than five of the same thing and less than seven of them. Here you're talking about eighths, but it's equally true of songs, stars, or cows.
5.09 is greater than 0.95
hi
1/8 (one-eighth).
two sixths is greater.
One minus one eighth is seven eighths.
08
NO
No.
There is no eighth horcrux, as Voldemort only created seven.