I drew a triangular tree on the top left side of the chalkboard and divided the image into triangles. Too, I assigned each triangle a number as I counted how many triangles there were in total.
Then I drew a second triangular tree and asked if any of my students wanted to repeat the work I had just completed with this singular image. I had a child volunteer instantly.
After she worked for almost thirty minutes, a second elder approached me and asked I they could also do the work. As there was room on the chalkboard, I agreed but drew a bowed gift box instead. She looked at it, got a ruler and went to work.
Here are a dozen or more photographs of their work. Note that the children wrote all but a few of the numbers written on the triangles. When the chalk broke a few times, I assisted. It was simply amazing watching them work.
(Note : The board was washed by a younger student just prior to my initial work. I am repainting the chalkboard over the holidays. )