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Pretzel and marshmallow solid geometric figures are assembled here

Subject:

Math  

Grade:

3  

Title – Pretzel and Marshmallow Solids
By – Susanne Cauley
Primary Subject – Math
Grade Level – 3

Concept / Topic To Teach:

  • Solid Figures

Standards Addressed:

  • NC Standard Course of Study – 3rd Grade Math
      Objective 3.01 – Use appropriate vocabulary to compare and describe three-dimensional figures.

General Goal(s):

  • Describe a solid figure by telling about its parts.

Specific Objectives:

  • Classify space figures and identify the faces, edges and corners.

Required Materials:

  • 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
    • baseball
    • stick of butter
    • jack-in-the-box (or other available solid objects)

Step-By-Step Procedures:

  1. Define face, edge and corner (also know as vertex or vertices). Face
        : flat surfaces created by line segments

    Edge

        : line segment where two faces meet

    Corner or Vertex

      : where three or more edges meet
  2. 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
  3. Show children that pyramids can have squares for a base or triangles for a base.

Plan For Independent Practice:

  1. Pass out the pretzel sticks and marshmallows.
  2. 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!)
  3. 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:

  1. How many marshmallows would you need to build 2 cubes?
  2. 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 !

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