Lesson plan

10. Decompose whole numbers to determine if they are even or odd (A)

teaches Common Core State Standards CCSS.Math.Content.2.OA.C.3 http://corestandards.org/Math/Content/2/OA/C/3
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
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Lesson objective: Decompose whole numbers to determine if they are even or odd.

This lesson provides an opportunity for students to apply their knowledge and understanding of even and odd whole numbers to a real-life situation. Students are asked to decompose a set of tickets into even and odd numbers to be redeemed for prizes at the Odd and Even Carnival.

Key Concept students will use: 

  • We can write an equation to show that an even whole number is the sum of two equal addends.

Skills students will use:

  • Add up to four two-digit numbers using strategies based on place value and properties of operations. (Grade 2, Unit 11)
  • Adding and subtracting whole numbers within 100. (Grade 1, Unit 1, 2)
  • Whole numbers are either even or odd. Even numbers are the sum of two equal whole addends, and odd numbers are not.
  • We can count by twos or pair objects to determine whether there is an odd or even number in a group.

Students engage in Mathematical Practice 4 (Model with mathematics) as they explore combinations of even and odd numbers to determine what ticket amounts they can redeem for prizes at the Odd and Even Carnival. Students also engage in Mathematical Practice 7 (Look for and make use of structure) as they utilize different strategies to create different combinations of even and odd numbers.

Key vocabulary: 

  • addend
  • decompose
  • doubles addition fact
  • doubles addition fact plus one
  • even 
  • odd
  • sum

Special materials needed:

  • counters (optional)