Students explore the meaning of even and odd numbers, learning various interpretations and relating these interpretations to addition. Lesson 17 introduces even numbers via doubles. In Lesson 18, students pair up to 20 objects and see that, when objects are paired with none remaining, the number is even (2.OA.3). They see that objects arranged in columns of two also create two equal groups. By Lesson 19, students have a keen understanding of how to determine whether or not a number is even. Topic D culminates with students using arrays to investigate even and odd numbers. Through these explorations, students build an intuitive understanding of prime, composite, and square numbers, which is foundational for later grade levels.
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