Thinkabara

🧮 5th Grade · Math5.NF.A.2Unit 5: Adding & subtracting fractions

Estimate with benchmarks

Google Classroom

🎯 Objective: Students estimate fraction sums with 0, 1/2 and 1 to check answers.

Lesson outline

  1. Is 2/5 + 1/2 more or less than 1?
  2. Use benchmarks to catch the common mistake 2/5 + 1/2 = 3/7.
  3. Practice.
  4. Exit: estimate then solve.

Lesson 4 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

5.NF.A.2

Common Core State Standards for Mathematics, Grade 5 — typical US scope & sequence

🏁 Unit goals

  • Add and subtract fractions and mixed numbers with unlike denominators
  • Estimate with benchmark fractions

✅ 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: Fractions: add, subtract, multiply📚 All 5th Grade skills🎮 Learning games⚡ Capy Live class quiz

🗓️ Plan the whole year like this

Add 5th Grade Math to your free Lesson Planner: enter your timetable once and every period shows the next lesson, skipping weekends and school breaks.

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More lessons in “Adding & subtracting fractions”

  1. Unlike denominators with models
  2. Common denominators
  3. Mixed numbers
  4. Estimate with benchmarks
  5. Fraction word problems

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