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🧮 4th Grade · Math4.OA.A.3Unit 2: Adding & subtracting multi-digit numbers

Estimate and check

Google Classroom

🎯 Objective: Students estimate to check whether answers are reasonable.

Lesson outline

  1. Estimate 4,892 + 3,107 before solving.
  2. Show a worked example with a mistake; use the estimate to catch it.
  3. Partners solve and check each other with estimates.
  4. Exit: estimate, solve and explain if it is reasonable.

Lesson 3 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

4.OA.A.3

Common Core State Standards for Mathematics, Grade 4 — typical US scope & sequence

🏁 Unit goals

  • Fluently add and subtract with the standard algorithm
  • Estimate to check reasonableness

✅ 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

📚 All 4th Grade skills🎮 Learning games⚡ Capy Live class quiz

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More lessons in “Adding & subtracting multi-digit numbers”

  1. Standard algorithm: addition
  2. Standard algorithm: subtraction
  3. Estimate and check
  4. Multi-step word problems

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