I have found that my students often have trouble asking and answering questions about key details because they don't understand what key details really are. I decided to create these sorting activities to go with books that we read early in the year.
The books addressed are:
David Goes to School by David Shannon
Goldilocks and the Three Bears by James Marshall
Chrysanthemum by Kevin Henkes
Chester's Way by Kevin Henkes
Wemberly Worried by Kevin Henkes
Owen by Kevin Henkes
Each book has a class sort. The students sort the statements as key details or interesting details. I have also included student sorts for all the stories except David Goes to School. (They are the same sorts as the class sorts). This can be used in a variety of ways. The first way is to do the sort as a class. I sometimes divide my students into small groups and give each group a statement. The groups are given time to discuss where to put their statement. Then, we sort based on their decisions. You have to do a lot of explaining and modeling. Another way to use the sorts would be to give students a sort and have them place items on the sort where they think it goes. Then, they come together and sort as a class, going back to check their own sorts afterwards. Of course, it can also be done independently.
I hope this helps your students to identify key detaiils.