Multiplying fractions
2 minutes and 28 seconds on multiplying fractions. Recorded as a quick reminder for students on a return to study course.
Produced on my College issue laptop using the free version of the NCH Debut screen and Webcam capture software, and using the cheapo USB microphone (Logitech and Belkin sell the same oem device). Attempts to use the built in microphone on the laptop failed despite the placement of the microphone high up on the screen near the Web cam.