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🧮 3rd Grade · Math3.OA.D.8Unit 6: Multiplying by multiples of 10 & patterns

Reasonable answers

Google Classroom

🎯 Objective: Students use estimation and mental math to judge if an answer makes sense.

Lesson outline

  1. Show a wrong answer: 42 + 38 = 710. Does it make sense?
  2. Estimate first, then solve; compare.
  3. Partners check each other’s work with estimates.
  4. Exit: explain how you knew an answer was not reasonable.

Lesson 4 of 4 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.D.8

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

🏁 Unit goals

  • Multiply one-digit numbers by multiples of 10
  • Identify arithmetic patterns

✅ 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 “Multiplying by multiples of 10 & patterns”

  1. Multiplying by multiples of 10
  2. Patterns in the multiplication table
  3. Two-step word problems
  4. Reasonable answers

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