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🧮 4th Grade · Math4.NBT.B.4Unit 2: Adding & subtracting multi-digit numbers

Standard algorithm: subtraction

Google Classroom

🎯 Objective: Students subtract multi-digit numbers, including across zeros.

Lesson outline

  1. Model 4,005 − 1,238 with disks: unbundle a thousand into hundreds, tens and ones.
  2. Record regrouping across zeros step by step.
  3. Practice; check by adding.
  4. Exit: 6,003 − 2,457.

Lesson 2 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.NBT.B.4

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

🎯 Practice: Multi-digit multiplication📚 All 4th Grade skills🎮 Learning games⚡ Capy Live class quiz

🗓️ Plan the whole year like this

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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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