These countdown timers are useful tools for classroom management. The 30 minute timer, 20 minute timer, 15 minute timer, 10 minute timer, 5 minute timer, and 1 minute timer are zipped and in video form (.mp4) and can be embedded in Powerpoint, Google Slides, and Keynote presentations. The timers can also be used through different video player applications. This resource includes 18 Countdown Timers including the following: 30 Minute Timers20 Minute Timers15 Minute Timers10 Minute Timers5 Minute