# The Sum of Odd Numbers

What is proof and how might we understand it in the context of developing a way finding the sum of the first N odd numbers?

We interviewed Dr. Ken Davidson (University of Waterloo) on this theme, and you can view the six video clips of his interview by clicking on the titles at the bottom of the interactive below. The order of the video clips is left to right. There are also two other videos that you can view, by clicking on the titles in the upper right-hand corner of the interactive.

You may want to view and print an activity about the sums of even numbers; and also view and print our poster about the sum of odd numbers.