Thinkabara

🧮 3rd Grade · Math3.OA.B.5Unit 3: Properties & multiplication facts

Associative property

Google Classroom

🎯 Objective: Students group three factors in different ways to multiply.

Lesson outline

  1. Ask: what is 2 × 5 × 7? Half the class multiplies (2 × 5) × 7, half 2 × (5 × 7).
  2. Compare: both give 70; grouping changes the work, not the answer. Show it with 2 layers of 5 × 7 cubes.
  3. Students look for friendly pairs (2 × 5, 5 × 4) in 4 × 7 × 5, 3 × 2 × 5 and 6 × 2 × 4.
  4. Exit: 3 × 2 × 5 — circle the pair you multiplied first.

Lesson 5 of 7 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.B.5

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

🏁 Unit goals

  • Use commutative, associative and distributive properties to multiply
  • Fluently multiply and divide within 100

✅ 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

Add 3rd 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 “Properties & multiplication facts”

  1. Commutative property
  2. Facts of 3, 4 and 6
  3. Distributive property
  4. Facts of 7, 8 and 9
  5. Associative property
  6. 0 and 1 rules
  7. Fact fluency check

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