This lesson focuses on the observation of properties and the classification of objects to build ideas about variables. Learners compare buttons to identify similarities and differences. In addition, learners are introduced to Venn Diagrams by reading "The Elves and the Shoemaker" and sorting their shoes in a giant diagram.

I use this activity to reinforce the vocabulary used when practicing with polygons.  Students are asked to describe a polygon by identifying what it is, but also what it is NOT.