Share your computer's screen from one Chrome browser to another
Cast for Education allows you to turn your computer into a wireless projector for screen sharing from another device. Just install the extension, give your device a name, and invite your students to cast.
Teachers: Download this extension to set up your device for wireless screen sharing. If you are unable to download the extension, check with your school administrator.
Students: Simply cast to your teacher's screen name from your Chrome browser. You don't need this extension to cast.
For detailed instructions, see https://support.google.com/edu/castforedu.