Lesson 4
Decompose Even and Odd Numbers
Lesson Purpose
Lesson Narrative
In previous lessons, students determined whether groups of objects and representations had an even or odd number of objects by creating 2 equal groups or pairing objects.
In this lesson, students explore patterns in the ways they can represent even and odd numbers as sums of two addends. In the first activity, they decompose even and odd numbers in different ways and notice that only the even numbers of objects could be decomposed into two equal addends. In the second activity, students practice decomposing numbers into two equal addends and verify that even numbers can be represented as a sum of two equal addends. They will continue to use expressions with equal addends to represent arrays in upcoming lessons and will relate multiplication expressions to addition expressions with equal addends in grade 3.
Throughout the lesson, it is important to emphasize that even numbers can be represented as a sum of two equal addends. Avoid communicating a misconception that odd numbers can not be represented as a sum of two equal addends. Students will learn that odd numbers cannot be represented as a sum of two equal whole numbers as they learn more about whole numbers and fractions in later grades.
 Representation
 MLR5
Learning Goals
Teacher Facing
 Represent an even number as the sum of two equal addends.
Student Facing
 Let’s represent even and odd numbers.
Required Materials
Materials to Gather
Required Preparation
Lesson Timeline
Warmup  10 min 
Activity 1  20 min 
Activity 2  15 min 
Lesson Synthesis  10 min 
Cooldown  5 min 
Teacher Reflection Questions
Suggested Centers
 Target Numbers (1–5), Stage 7: Subtract Hundreds, Tens, or Ones (Supporting)
 Five in a Row: Addition and Subtraction (1–2), Stage 8: Add within 1,000 with Composing (Supporting)
 How Close? (1–5), Stage 4: Add to 1,000 (Supporting)
Print Formatted Materials
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Additional Resources
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