Make sure that all of your Google Classroom students download this very important extension for Google Chrome. It is called "Share to Classroom." Clicking the link will take you to the download page in the Chrome Web Store. If you and your students all have this extension, you can go to any website (or web link) and send it directly to the entire class all at once. The site will open automatically in the student's browser. This is perfect for a tech lab scenario. As a teacher, this means you can send a shared Google Doc or Google Slides presentation, a video link, a Drawing, an online photo. Anything with a web URL.
After downloading the Share to Classroom extension, it will then appear as the familiar Google Classroom icon/button in the top right of Google Chrome (see below for an example).
When you click on the Share to Classroom button, it will present you with all of the "Classrooms" you teach or are enrolled in. First, the site or link must be open in Google Chrome and the teacher and students must be inside of Google Classroom for the magic to work. Which ever classroom you click on (see below) is the one that the link will be pushed out to. The web page, document, video, etc. will then open inside of the student's Chrome browser.
While this does not replace the posting of assignments and announcements in Google Classroom, it does offer a third alternative (a quick push of a web link) without a link having to be posted to the "classroom." A quick video, document, photo or site can be sent out for students to see or to make a point clearer. The Share to Classroom extension is just another effective teaching tool to add to your Google toolbox.