Your explanation seems clear. I wonder what you think of this say vis-a-vis a SMARTBOARD video lesson that a teacher designs?
This is such a creative use of VoiceThread. I thought you might enjoy seeing how others I using to teach maths (see link below). While the math is much more complex that what you're kids are doing, I think it show the potentials of the medium that you are taping into.http://coxmath.pbworks.com/applying%20math%20in%20the%20real%20world%20-%20kathryn%20ivancovich#comment1235001173