This Slides template (goo.gl/337VnL) is great for younger students. They can work collaboratively in pairs or groups of 3 and different systems can be assigned. Once completed students can present their final project to the class.
This can be posted in Google Classroom as an assignment as "Make a copy for each student". One student in the pair or group will "Open" the assignment and then will share with their partner(s). After the sharing, the students who did NOT originally click "Open", can now click to "Open" the file and can delete the file that is created since that is not the one they are working on. This, also, helps alleviate any confusion for the teacher in knowing which is the group's actual working file. It is best if you remind all students to bookmark the file for easy access during the project.