No access to such technology? Use sets of colored index cards, which students
can hold up and turn in for each problem, with their names on each card.
These are not just catchy moves. They are as essential to teaching as any
reading, lecture, or discussion because they let learner as well as teacher know
what is and isn’t being understood in time to make any needed adjustments.
These approaches signal that teaching is much more than informing; it
requires constant attention to the course of the learning, because that’s how
understanding occurs—through the learner’s repeated and increasingly successful
attempts to learn, coupled with the teacher’s feedback and guidance
(in addition to the initial instruction).