Lesson plan

6. Three-digit addition with regrouping (A)

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teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.7 http://corestandards.org/Math/Content/2/NBT/B/7
teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.9 http://corestandards.org/Math/Content/2/NBT/B/9
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8
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Lesson objective: Add two three-digit numbers involving regrouping 10 ones to make a new ten, and/or 10 tens to make a new hundred. 

This lesson provides an opportunity for students to apply their knowledge and understanding of three-digit addition with regrouping to a mathematical situation. Students are asked to validate or invalidate Dev's statement that the problem 496 + 404 only involves regrouping in the ones place.

Key Concept students will use: 

  • Addition strategies (such as regrouping) used with two-digit numbers can be used with three-digit numbers.

Skills students will use:

  • Add numbers within 1,000 using knowledge of place value and properties of operations
  • Add numbers within 100 using knowledge of place value (Grade 2, Unit 1)
  • Represent three-digit numbers in different but equivalent ways (Grade 2, Unit 6)
  • Understanding ten ones make a ten (Grade 1, Unit 1)

Students engage in Mathematical Practice 8 (Look for and express regularity in repeated reasoning) as they solve three-digit addition problems using previously learned strategies. Students will also apply regrouping strategies from two-digit addition to three-digit addition. Base ten blocks, number lines, and strategies related to place value will support students' understanding in this lesson.

Key vocabulary: 

  • base ten blocks
  • compose
  • decompose
  • digit
  • equivalent
  • hundreds
  • number line
  • ones
  • place value
  • regroup
  • tens
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