We don't always have time to or need to give our students a test to do a quick check of the class -- that's where Plickers comes into play.
Plickers is a simple app that allows teachers to collect formative assessment data without student devices. Use the Plickers.com site to create a teacher account, set up your classes, assign your students a plickers card and create questions. You will also print your cards from the website. Once you have everything set up, install the plickers app on your mobile device (any mobile device) and use it to scan student answers.
Plickers has a great help section to get you started or you can go this Plickers playlist on YouTube for additional help.