Lesson plan

6. Solve problems by decomposing numbers to 10 (A)

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 provides an opportunity for students to apply their knowledge and understanding of subtraction to a real-life situation. Students are asked to find different ways that seven cookies can be put onto two plates.

Key Concept students will use: 

  • A total can be taken apart into more than one pair of addends.

Skills students will use:

  • Adding numbers to 10
  • Subtracting numbers to 10
  • Counting up to 10 objects (Kindergarten, Unit 2)

Students engage in Mathematical Practice 3 (Construct viable arguments and critique the reasoning of others) as they explain why they agree or disagree that there are eight ways to take apart the number seven.

Key vocabulary: 

  • addition
  • decompose
  • subtraction

Special materials needed:

  • manipulatives, such as counters