This is a 5E math lesson plan using the book "The Greedy Triangle" by Marilyn Burns to teach students how to classify the number of vertices and sides in 2-D shapes.
--Full lesson plan
--Suggested questions classified by Bloom's Taxonomy
--Rubric for assessing student work
*If your school does not allow food, you could substitute play-dough for the marshmallows in the activity given. :)