view a plan
Pretzel and marshmallow solid geometric figures are assembled here
By – Susanne Cauley
Primary Subject – Math
Grade Level – 3
Concept / Topic To Teach:
- Solid Figures
- NC Standard Course of Study – 3rd Grade Math
- Objective 3.01 – Use appropriate vocabulary to compare and describe three-dimensional figures.
- Describe a solid figure by telling about its parts.
- Classify space figures and identify the faces, edges and corners.
- set of solid figures
- real-world examples of solid figures
- large marshmallows
- pretzel sticks
- math notebooks
Anticipatory Set (Lead-In):
- Review names of solid figures by holding up the following items:
- can of soup
- cheerleading megaphone
- stick of butter
- jack-in-the-box (or other available solid objects)
- Define face, edge and corner (also know as vertex or vertices). Face
- : flat surfaces created by line segments
- : line segment where two faces meet
Corner or Vertex
- : where three or more edges meet
- Create a table together. (Teacher models and students copy and record data in math notebooks.)
Solid Figure Faces Edges Corners Sphere 0 0 0 Cube 6 12 8 Rectangular Prism 6 12 8 Pyramid 5 8 5 Cone 0 0 0 Cylinder 0 0 0
- Show children that pyramids can have squares for a base or triangles for a base.
Plan For Independent Practice:
- Pass out the pretzel sticks and marshmallows.
- Instruct students to build a cube using the pretzel sticks as the line segments and marshmallows as the corners. (I usually just pass out enough extras so students can eat a few to start with, then they will focus more on the work instead of constantly asking when they can eat!)
- Once a cube has been constructed, instruct students to build a pyramid. They can build one with a square base or a triangle base or both as time allows.
Closure (Reflect Anticipatory Set):
- Do your pretzel marshmallow structures have the proper number of faces, corners and edges? Compare them to your chart.
- Can you build any other solid figures with these same pretzel sticks and marshmallows? Why not?
Assessment Based On Objectives:
- How many marshmallows would you need to build 2 cubes?
- How many pretzel sticks would you need to make 3 pyramids?
Adaptations (For Students With Learning Disabilities):
- Work with a partner to construct pretzel marshmallow solids.
Extensions (For Gifted Students):
- What materials could be used to create models of the other solid figures. Create some of these?
Possible Connections To Other Subjects:
- Write a journal entry explaining which solid figure is your favorite and why.
E-Mail Susanne Cauley !