Lesson plan

5. Practice decomposing numbers to 10 (FP)

teaches Common Core State Standards CCSS.Math.Content.K.OA.A.1 http://corestandards.org/Math/Content/K/OA/A/1
teaches Common Core State Standards CCSS.Math.Content.K.OA.A.2 http://corestandards.org/Math/Content/K/OA/A/2
teaches Common Core State Standards CCSS.Math.Content.K.OA.A.3 http://corestandards.org/Math/Content/K/OA/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6
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Lesson objective: Decompose numbers less than or equal to 10 into pairs in more than one way.

This lesson helps to build procedural skills with decomposing numbers. Modeling with two-sided counters  is used here because it supports students as they build a visual representation of decomposition. This work develops students' understanding that a total can be taken apart into more than one pair of addends.

Students engage in Mathematical Practice 6 (Attend to precision) as they count the objects in each part and recognize that the total stays the same even though the parts change.

Key vocabulary:

  • decompose
  • parts
  • total

Special materials needed:

  • cups
  • recording sheet (optional)
  • two-sided counters