Thinkabara

🧮 1st Grade · Math1.G.A.1Unit 12: Shapes & equal parts

Defining attributes

Google Classroom

🎯 Objective: Students tell what makes a shape a shape (sides, corners) versus color or size.

Lesson outline

  1. Show a big red triangle and a small blue one.
  2. Sort “always true” vs “sometimes true” statements.
  3. Draw shapes from attribute clues.
  4. Exit: what makes a triangle a triangle?

Lesson 1 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

1.G.A.1

Common Core State Standards for Mathematics, Grade 1 — typical US scope & sequence

🏁 Unit goals

  • Tell defining from non-defining attributes of shapes
  • Compose shapes
  • Split circles and rectangles into halves and fourths

✅ 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: Shapes & halves📚 All 1st Grade skills🎮 Learning games⚡ Capy Live class quiz

🗓️ Plan the whole year like this

Add 1st 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 “Shapes & equal parts”

  1. Defining attributes
  2. Compose 2D shapes
  3. 3D shapes
  4. Halves
  5. Fourths

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