Demonstration, Flash, IWB, Projector, Visualization
A set of clear, engaging animations showing how we multiply using base ten blocks. Carrying (regrouping, trading) is also covered in depth. There are step-by-step explanations that can be turned off if you are presenting the animations to a class on the IWB or projector. Free.
6 December 2011 Edit: 3 February 2019
User submitted, thanks to Tal Greengard