Tell children that when they raise their hand, you'll come to them and they'll whisper their answer to you. This is especially useful after asking a question to the class that involves some thinking.
Rather than calling on a single individual, you have students raise their hands and you listen to many of them.
Purpose: It is fun for the kids and often for you, but it’s much more serious than that. It gives many children a chance to answer, which is impossible after one child gives the answer out loud. Moreover, you get an instant, and pretty good, assessment of where the children are, much better than a test can give because this assessment is on the spot. If one child answers out loud and we just ask who agrees, we don't get nearly as good a sense of who understands what.