How do you accomplish this? By using Google Cast for Education! Google Cast for Education is a Chrome app that can be downloaded and installed from the Chrome Web Store. Both parties, the teacher and the students must have this app installed in order for the screen share to take place.
Note: If teachers or students are not permitted to download and install apps from the Chrome Web Store, it will have to be done by the Google Administrator from the domain level.
Once the app is installed for both users, the teacher would have to setup their device by completing the following steps:
1. You must enter a RECEIVER'S NAME, I would recommend typing your name or 'Teacher', and press SAVE.