Thinkabara

🧮 3rd Grade · Math3.OA.A.4Unit 2: Meaning of division

Unknowns in equations

Google Classroom

🎯 Objective: Students find the unknown number in multiplication and division equations.

Lesson outline

  1. Show 5 × ? = 40, ? ÷ 3 = 6 and 48 = ? × 6. What could the ? be?
  2. Model thinking with arrays and fact families.
  3. Students solve a mixed set and write one of their own for a partner.
  4. Exit: solve three unknowns.

Lesson 4 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

3.OA.A.4

Common Core State Standards for Mathematics, Grade 3 — typical US scope & sequence

🏁 Unit goals

  • Interpret division as sharing or grouping
  • Relate division to multiplication as an unknown-factor problem

✅ 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: Multiplication & division within 100🖨️ Worksheet: Multiplication Facts 2–10📚 All 3rd Grade skills🎮 Learning games⚡ Capy Live class quiz

🗓️ Plan the whole year like this

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More lessons in “Meaning of division”

  1. Sharing equally
  2. Making equal groups
  3. Division as unknown factor
  4. Unknowns in equations
  5. Division word problems

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