I teach a 7th grade CCD class. One Sunday, I used the ten commandments as a basis for the Examination of Conscience. I think this would also work for fourth graders where you could get them involved in the classroom.
We wrote on the board what all the ten commandments were, and gave examples. There are 15 kids in the class, and the majority participated. I used the Examination of Conscience as a basis to use before going to the Sacrament of Reconciliation.
I also explained the seal of confession, and that the penitent can go either behind the curtain or face-to-face. I could tell I was getting through to the kids, when one shy 7th grade boy in particular asked, “you mean the priest is not allowed to tell our parents what are sins were?”
Our parish is doing Reconciliation Services during the month of December. Two weeks ago, I went to one where the priest had all the kids present (and there were many) go first for Reconciliation. This was done in part for the children to be able to get home at a reasonable hour too, and I was pleased that many children of all ages attended. I was also pleased that many of their parents came, and received the Sacrament of Reconciliation as well. I’m also glad that our parish priests has emphasized the importance of this Sacrament.