Python won 't do decimals

[SomebodySmart]

It took me a lot of tries before I was able to figure out the problem, and I was stunned. When building my genealogy website, I display 100 entries per page, but I don't want final pages with only a small handful. If there remain 101 entries I'd rather display 51 on one page and 50 on the next. It should have been simple with

z = (remainder / 2)
z = int(z + 0.6)

However, it makes things worse. It takes the first line and instead of z = 50.5 it says z = 50 and the next line doesn't help. The program puts 50 lines on one page, 50 on the next and then builds a page with one lone entry. I had to work around and say

if remainder % 2 == 1:
     z = z + 1

I don't recall this happening before in the years I've been coding in Python.

What is the way to say I absolutely want a decimal answer to remainder / 2 and also not a string variable because I need to do more math with it ?