Lesson plan

7. Rounding to estimate using addition (A)

teaches Common Core State Standards CCSS.Math.Content.4.NBT.A.3 http://corestandards.org/Math/Content/4/NBT/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Lesson objective: Apply rounding to approximate a total.

This lesson provides an opportunity for students to apply their knowledge and understanding of rounding to a real-life situation. Students are asked to round three numbers and add the results to get a total approximation of visitors at an amusement park.

Key Concept students will use: 

  • Rounding to approximate multiple values

Skills students will use:

  • Rounding numbers to the thousands
  • Adding whole numbers 

Students engage in Mathematical Practice 8 (look for and express regularity in repeated reasoning) as they use the structure of the base-ten system to generalize their strategies to round a six digit number to different places.   

Key vocabulary: 

  • approximate
  • exact
  • round

Special materials needed:

  • paper
  • pencil