〜ずつ

ずつ
suffix
each, at a time, apiece
1. each, at a time
Suffix attached to quantity expressions to indicate equal distribution or gradual progression. Shows that something is done in equal portions or increments.
Please take one each.
I gradually came to understand Japanese little by little.
Please form groups of three people each.
Please take one sheet of paper each and write your name.
If you learn kanji little by little every day, you'll be able to read many kanji in a year.

USAGE PATTERNS:

MEANINGS:
1. Equal distribution: (いっ)()ずつ(くば) (distribute one each)
2. Gradual progression: (すこ)ずつ上手(じょうず)なる (get better little by little)

The suffix attaches directly to the quantity word without particles.