I don’t know how I missed it, but Chrome OS version 52 came out back in July. That might now mean much too you, except that it means Chromebooks can now use Google Cast for Education without having to be running beta software.
Google Cast for Education allows student Chromebooks to be able to broadcast their screen wireless to a teacher computer hooked to a projector. I’ve only played with it a little and will have a longer review later. Try it out and let me know what you think!