ずつ

with counting, measurements, or language.

A) Add little by little
B) separate a group by a certain amount.

hihlordjp from the forums wrote:
I have a little comment regarding 「ずつ」. I was taught it's づつ, which I believe is an older form. I'm not certain of the usage guidelines regarding the two variants, but I think it's generally safe to conclude that the former is the more modern, preferred form. ...Just thought to impart that.

Clay's Response:
I am glad it will be of help. Please do let me know if you find any corrections or find good examples. There is a submit link there.

I had never heard that. But I did look it up in a dictionary and it does give づつ as an alternate reading. I asked Yumi and she said she used both forms as a child, but was taught the ずつ form was correct in school.

After doing a google search, I found someone who has done all the research for us: http://blog.so-net.ne.jp/yuukok/2005-02-01 Great page. That person like Yumi was taught ず�