Lesson plan

7. Use decomposition and regrouping to add (FP)

teaches Common Core State Standards CCSS.Math.Content.3.NBT.A.2 http://corestandards.org/Math/Content/3/NBT/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
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Lesson objective: Add numbers within 1000 by decomposing values to make regrouping easier.

This work develops students' understanding that the order of addends when adding will not affect the sum.

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they use place value to decompose values into smaller amounts that can be used to make addition of numbers more efficient.

Key vocabulary:

  • addends
  • decompose
  • sum

Special materials needed:

  • base ten blocks