Thinkabara

🧮 2nd Grade · Math2.NBT.B.7Unit 6: Adding & subtracting within 1,000

Regrouping in subtraction

Google Classroom

🎯 Objective: Students subtract with regrouping, including across zeros.

Lesson outline

  1. Model 403 − 158 with blocks.
  2. Break a hundred into tens.
  3. Practice and check.
  4. Exit: 500 − 236.

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

2.NBT.B.7

Common Core State Standards for Mathematics, Grade 2 — typical US scope & sequence

🏁 Unit goals

  • Add and subtract within 1,000 using models and place value strategies
  • Explain why strategies work

✅ 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: Add & subtract within 100🎯 Practice: Place value to 1,000🖨️ Worksheet: Two-Digit Addition Within 100🖨️ Worksheet: Two-Digit Subtraction Within 100📚 All 2nd Grade skills🎮 Learning games⚡ Capy Live class quiz

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More lessons in “Adding & subtracting within 1,000”

  1. Adding three-digit numbers
  2. Regrouping in addition
  3. Subtracting three-digit numbers
  4. Regrouping in subtraction
  5. Explain your strategy

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