Thinkabara

🧮 2nd Grade · Math2.NBT.B.5Unit 4: Adding within 100

Open number line

Google Classroom

🎯 Objective: Students add using jumps of tens and ones on an open number line.

Lesson outline

  1. Model 47 + 35: jump 30, jump 5.
  2. Compare with other strategies.
  3. Solve on number lines.
  4. Exit: 29 + 46.

Lesson 3 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.5

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

🏁 Unit goals

  • Add two-digit numbers using place value strategies
  • Add up to four two-digit numbers

✅ 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🖨️ Worksheet: Two-Digit Addition Within 100🖨️ Worksheet: Two-Digit Subtraction Within 100📚 All 2nd Grade skills🎮 Learning games⚡ Capy Live class quiz

🗓️ Plan the whole year like this

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More lessons in “Adding within 100”

  1. Adding tens and ones
  2. Regrouping ones
  3. Open number line
  4. Compensation
  5. Adding several numbers

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