Next, I used a lesson created by a "Math Guru" in my district. I have attached the link to her posting of the same lesson here We began by reading The Greedy Triangle, by Marilyn Burns. This cute story follows a triangle who unsatisfied with his shape, requests the local shapeshifter to add another side and angle to him so that he can become a quadrilateral. This pattern repeats and as he continues to add more angles and sides we see him transform into pentagons, hexagons, heptagons, octagons, nonagons, and decagons.

While I read the story, my students explored making the various shapes using large fuzzy pipe cleaners (they were a real hit!). These pipe cleaners can be found at Michaels. They absolutely loved this activity. As they continued to work with the materials, adding sides and angles, they demonstrated a concrete understanding of 2-D shapes.

To summarize the lesson, I had the students write in their math journals. I showed examples of each of the shapes as asked them to write about each one. I wrote the question on the board, "What makes a triangle a triangle?". We discussed the properties of triangles and this brought forth much of the geometry language we will be using over the new few weeks. Above is a sample from a journal.

Hi Mrs. Barker,

ReplyDeleteI really like the way you teach Math. The kids must have a lot of fun during the class. If I had you as my math teacher when I was in junior high, Math would not be my lifetime nighmare

anymore.

Sydney