The Grandpa Project -- Multiplying or Dividing by 10, 100, 1000, ... , etc.

This is part of a series of arithmetic lessons created for my grandkids, but I'm opening them to the world. You can access an annotated index with links on my Math Without Borders website here: https://mathwithoutborders.com/the-grandpa-project ... https://www.youtube.com/watch?v=h2YSDT3biP8