Thinkabara

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

Adding tens and ones

Google Classroom

🎯 Objective: Students add two-digit numbers by adding tens then ones.

Lesson outline

  1. Number talk: 34 + 25.
  2. Model with blocks and an open number line.
  3. Practice without regrouping.
  4. Exit: 42 + 36.

Lesson 1 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

Add 2nd Grade Math to your free Lesson Planner: enter your timetable once and every period shows the next lesson, skipping weekends and school breaks.

Add to my planner See the year’s sequence

More lessons in “Adding within 100”

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

Something to improve in this lesson? Tell us.