Here& a page for use with the book THE GREEDY TRIANGLE by Marilyn Burns. As the triangle changes its shape, students build each shape with marshmallows and toothpicks and record information about sides, angles, and vertices.
Audience: First Grade. Behavior: Classify shapes using informal geometric language. I would introduce some familiar shapes and ask the students to identify how many sides and vertices using an anchor chart.
Shape monsters are a great way to combine Halloween with math! You can incorporate shapes, vertices and adjectives all in one. Have the kids create their shape monster then describe it using math vocabulary and adjectives