Thinkabara

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

Counting up to subtract

Google Classroom

🎯 Objective: Students subtract by counting up on an open number line (73 − 48).

Lesson outline

  1. Model jumps from 48 to 50 to 70 to 73.
  2. Compare with taking away.
  3. Choose the best strategy.
  4. Exit: 82 − 57.

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

  • Subtract two-digit numbers using place value strategies
  • Check subtraction with addition

✅ 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 “Subtracting within 100”

  1. Subtracting tens and ones
  2. Regrouping a ten
  3. Counting up to subtract
  4. Check with addition
  5. Subtraction word problems

Something to improve in this lesson? Tell us.