In a matter of seconds you can create an exit slip for all of your classes to complete. Just click the "+" in the lower right corner and choose "Question". You can ask a multiple choice question or an open-ended question. Students will be able to see each other's responses, but not until they have answered. Also, you can choose whether you want students to be able to respond/reply to each other. This is a great opportunity to teach appropriate and respectful online behavior.
Crack the Code is one of my favorite cooperative activities. While there are several versions of this activity, I found the one created by Ryan Ellis particularly interesting. I discovered it while listening to his podcast . I then headed to his website to see the activity sheets he created. Inspired by this activity, I created a Google Slides doc to use in class. Click on the pic below to view a copy. Download or make a copy for yourself! The last two slides are the Teacher instructions. Enjoy!