Thinkabara

🧮 1st Grade · Math1.OA.C.6Unit 3: Addition strategies within 20

Doubles plus one

Google Classroom

🎯 Objective: Students use a known double to add near doubles (6 + 7 = 6 + 6 + 1).

Lesson outline

  1. Review doubles to 10 + 10.
  2. Model 6 + 7 as a double plus one with cube towers.
  3. Sort facts: doubles, doubles plus one, other.
  4. Exit: 7 + 8.

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

1.OA.C.6

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

🏁 Unit goals

  • Add within 20 using counting on, make-a-ten and doubles plus one
  • Explain the strategy you used

✅ 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

Add 1st 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 “Addition strategies within 20”

  1. Make a ten to add
  2. Doubles plus one
  3. Choosing a strategy
  4. Addition facts to 20 fluency
  5. Missing addends

Something to improve in this lesson? Tell us.