# Diagrams, week 1

It is officially a thing now to post a photograph from our classrooms every day of the school year. I can’t keep up with that.

But I have written about the importance of differentiating between diagrams and decorations. And I have a swanky new iPad (Thanks TED-Ed!) So I’ll aim to get a diagram from my teaching up here each week. Some will be mine. Some will be my students’. Some may represent thinking transparently. Others may be more challenging to interpret.

All will be examples of representing mathematical thinking with pictures.

Today we worked on the Oreo problem in College Algebra. Specifically, given information freely available on the Nutrition Facts labels on regular and Double Stuf Oreos, and given the assumption that Double Stuf Oreos are in fact doubly stuffed, we asked:

Where are there more calories in an Oreo? In the wafers or in the stuf? And how many calories are in each?

Along the way, I drew this diagram to represent a student’s words. The A, B, C and D were his letters, as were what they referred to. I just drew the picture for all to see.