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🧮 2nd Grade · Math2.OA.A.1Unit 2: One- and two-step word problems

Start unknown problems

Google Classroom

🎯 Objective: Students solve problems where the start is unknown (some birds, 6 more came, now 15).

Lesson outline

  1. Act it out with a mystery bag.
  2. Model the tape diagram with the unknown first.
  3. Solve in pairs.
  4. Exit: write an equation with a symbol.

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

2.OA.A.1

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

🏁 Unit goals

  • Solve one- and two-step problems within 100
  • Use drawings, tape diagrams and equations with a symbol for the unknown

✅ 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: Equal groups — the road to multiplication📚 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 “One- and two-step word problems”

  1. Tape diagrams
  2. Start unknown problems
  3. Compare problems
  4. Two-step problems
  5. Write your own problem

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