Geoboard: Inside Outside

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Lesson Plan #2: Inside Outside (also taken from CD)
Grade Level: K

Objective: Students will develop an understanding of area as a number of square units needed to cover a region.

Materials:

• Geoboards (1 per a child)
• Rubber bands (several different colors)
• Geodot paper
• Color Tiles
• Crayons
• Pencil
• Record Sheet
• Smartboard/ Overhead or Elmo

Procedure:

*Allow student the day before the lesson to have 20 minutes to explore with Geoboards.

1. Model to students how to use one rubber band on the geoboard to create the largest possible square. Explain this is the outside region.
2. Keep the outer region and this time create a smaller region. (Refer to Teacher made smartboard lesson)
3. Pass out geoboards and have chidren duplicate what you made using two different color rubber bands.
4. Review that they have created two different regions (the inside "smaller shape" the other region is the outside region)
5. Ask children which region they think covers more space.
6. Disscuss/brainstorm - how we can find out they are correct (ex: count the pegs; use geodot paper; record data)
7. Model to students using color tiles how they can measure the outer region or inner region.
8. Model on the smartboard the same method.
9. Allow children to explore on own for a few minutes.
10. Call children attention to brainstorm what they have discovered. Call on children/pairs to post their drawings to see if anyone had a drawing with one square inside. If so ask how many small squares were outside that shape (record) Ask which shapes had more squares outside/inside.

Follow up:

• If your guess was close to your count, what helped you make such a close guess?
• After you found the number of squares inside your shape did you ever know the number of the outside squares without counting? Explain.
• What do you see when you look closey at the chart (record/data)?
• What do you notice about shapes that can be covered by the same number of squares?