The first grade teachers in my district are working on teaching their students parts of a whole. I found a post on The First Grade Parade Blog with several great fraction ideas on it. Here is one example...
To purchase the entire unit, go to Cara's TPT store Fraction Action.
Mrs. Saoud from Primary Graffiti also has a fun fractional parts lesson.
It uses insects. You can download the recording sheets for the lesson from her post.