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Geoboards

http://illuminations.nctm.org/LessonDetail.aspx?ID=L83

A lesson plan for grades K–2 Mathematics

Provider: National Council of Teachers of Mathematics


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This lesson, one of a five-part unit from Illuminations titled “Investigating Shapes: Recognizing, Constructing, and Identifying Triangles,” students identify and recognize triangles using multiple representations, locate triangles in their environment, and construct triangles. Students use geoboards to explore the characteristics of triangles.

North Carolina Curriculum Alignment

Mathematics (2004)

Grade 1

  • Goal 3: Geometry - The learner will identify, describe, draw, and build basic geometric figures.
    • Objective 3.01: Identify, build, draw and name parallelograms, squares, trapezoids, and hexagons.
    • Objective 3.02: Identify, build, and name cylinders, cones, and rectangular prisms.
    • Objective 3.03: Compare and contrast geometric figures.
    • Objective 3.04: Solve problems involving spatial visualization.

Grade 2

  • Goal 3: Geometry - The learner will perform simple transformations.
    • Objective 3.01: Combine simple figures to create a given shape.
    • Objective 3.02: Describe the change in attributes as two- and three-dimensional figures are cut and rearranged.
    • Objective 3.03: Identify and make:
      • Symmetric figures.
      • Congruent figures.

Kindergarten

  • Goal 3: Geometry - The learner will explore the concepts of geometry.
    • Objective 3.01: Identify, build, draw, and name triangles, rectangles, and circles; identify, build, and name spheres and cubes.
    • Objective 3.02: Compare geometric shapes (identify likenesses and differences).
    • Objective 3.03: Model and use directional and positional vocabulary.
    • Objective 3.04: Complete simple spatial visualization tasks and puzzles.