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Lesson Plan

5. Practice decomposing numbers to 10 (FP)

teaches Common Core State Standards CCSS.Math.Content.K.OA.A.1
teaches Common Core State Standards CCSS.Math.Content.K.OA.A.2
teaches Common Core State Standards CCSS.Math.Content.K.OA.A.3
teaches Common Core State Standards CCSS.Math.Practice.MP4
teaches Common Core State Standards CCSS.Math.Practice.MP5
teaches Common Core State Standards CCSS.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
Related content

Appears in

Understanding addition and subtraction within 10

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