I haven’t worked with the Doceri app much, but like that students can create their own recordings. Each group was given the lengths of the 3 sides of a triangle and had to determine if they had a right triangle or not. While making their recordings, there was too much background noise to narrate, so they did so while the slides played. I just noticed this group’s hashmarks on the legs of their triangle while typing this post. I wonder if they’ll spot it when I share this pic with them tomorrow?