Thinkabara

🧮 3rd Grade · Math3.NBT.A.1Unit 5: Place value, rounding & adding/subtracting within 1,000

Rounding to the nearest 100

Google Classroom

🎯 Objective: Students round three-digit numbers to the nearest 100.

Lesson outline

  1. Number line from 300 to 400 with 350 marked as the halfway point.
  2. Round 362, 350 and 349 and explain.
  3. Partner card game: draw a three-digit number, round it, partner checks.
  4. Exit: round 751 and 649 to the nearest hundred.

Lesson 2 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

3.NBT.A.1

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

🏁 Unit goals

  • Round to the nearest 10 or 100
  • Fluently add and subtract within 1,000

✅ 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: Round to 10 and 100📚 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 “Place value, rounding & adding/subtracting within 1,000”

  1. Rounding to the nearest 10
  2. Rounding to the nearest 100
  3. Estimating sums and differences
  4. Adding within 1,000
  5. Subtracting within 1,000

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