In the past I have always used Google Forms to poll my students to find out answers to my questions.  In the last few days Google Classroom has enabled this feature, which will save a lot of time. Watch the video below to find out how to do this.

 

 

This could be used as an exit ticket to check understanding, to vote on an aspect of your lesson, get feedback from the students, a host of ways this can be incorporated into your practice.