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🧮 6th Grade · Math6.G.A.1Unit 1: Area & surface area

Polygons by decomposing

Google Classroom

🎯 Objective: Students find areas of polygons by splitting them into rectangles and triangles.

Lesson outline

  1. Floor-plan problem.
  2. Compare decompositions.
  3. Practice.
  4. Exit: one polygon.

Lesson 3 of 5 in this unit. In the Lesson Planner this lesson takes 1–3 class periods depending on your timetable: day 1 introduce & model, then practice, small-group reteach and a quick check.

📐 Standard

6.G.A.1

Common Core State Standards for Mathematics, Grade 6 — typical US scope & sequence

🏁 Unit goals

  • Find areas of triangles, parallelograms and polygons by composing and decomposing
  • Find surface area with nets

✅ Check for understanding

End with the exit ticket in the outline. Sort answers into got it / almost / not yet and start the next lesson with a 5-minute reteach for the “not yets”.

Practice & resources on Thinkabara

📚 All 6th Grade skills🎮 Learning games⚡ Capy Live class quiz

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More lessons in “Area & surface area”

  1. Area of parallelograms
  2. Area of triangles
  3. Polygons by decomposing
  4. Nets and surface area
  5. Volume with fractional edges

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