Thinkabara

🧮 1st Grade · Math1.OA.B.3Unit 1: Addition & subtraction within 10

Turn-around facts

Google Classroom

🎯 Objective: Students see that changing the order of addends does not change the sum.

Lesson outline

  1. Show a domino; turn it around: 4 + 2 and 2 + 4.
  2. Record pairs of turn-around facts.
  3. Partners sort fact cards into turn-around pairs.
  4. Exit: write the turn-around fact for 1 + 6.

Lesson 2 of 6 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

1.OA.B.3

Common Core State Standards for Mathematics, Grade 1 — typical US scope & sequence

🏁 Unit goals

  • Add and subtract within 10 using objects, drawings and strategies
  • Use the commutative property (3 + 5 = 5 + 3)

✅ 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 20🖨️ Worksheet: Addition Within 20🖨️ Worksheet: Subtraction Within 20📚 All 1st Grade skills🎮 Learning games⚡ Capy Live class quiz

🗓️ Plan the whole year like this

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More lessons in “Addition & subtraction within 10”

  1. Counting on to add
  2. Turn-around facts
  3. Doubles
  4. Making 10
  5. Subtract by counting back
  6. Fact families

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