Thinkabara

🧮 5th Grade · Math5.G.B.3Unit 12: Classifying 2D figures

Triangles

Google Classroom

🎯 Objective: Students classify triangles by sides and angles.

Lesson outline

  1. Sort triangle cards by sides (equilateral, isosceles, scalene) and angles (acute, right, obtuse).
  2. Name each with two words.
  3. Practice.
  4. Exit: can a triangle be right and isosceles?

Lesson 1 of 3 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

5.G.B.3

Common Core State Standards for Mathematics, Grade 5 — typical US scope & sequence

🏁 Unit goals

  • Classify figures in a hierarchy by their properties

✅ 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

🎯 Practice: Coordinate plane📚 All 5th Grade skills🎮 Learning games⚡ Capy Live class quiz

🗓️ Plan the whole year like this

Add 5th Grade Math to your free Lesson Planner: enter your timetable once and every period shows the next lesson, skipping weekends and school breaks.

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More lessons in “Classifying 2D figures”

  1. Triangles
  2. Quadrilateral family tree
  3. Always, sometimes, never

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