If you want to find out whether your students really know as much as you think they know, polls and quizzes created with Socrative or Quizlet or in-class games and tools like Quizalize, Kahoot, FlipQuiz, Gimkit, Plickers, and Flippity can help you get a better sense of how much they really understand. (Grading quizzes but assigning low point values is a great way to make sure students really try: The quizzes matter, but an individual low score can’t kill a student’s grade.) Kids in many classes are always logged in to these tools, so formative assessments can be done very quickly. Teachers can see each kid’s response, and determine both individually and in aggregate how students are doing.