Lesson plan

# 1. Understand taking apart within 5 (C)

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.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective: Understand that numbers can be taken apart.

Students bring prior knowledge of addition from  K.OA.A.1 and K.OA.A.2. This prior knowledge is extended to contrast the new concept of subtraction as students learn that number can both be composed and alternatively decomposed. A conceptual challenge students may encounter is thinking that when a number is decomposed into groups, this action increases the total in the set.

The concept is developed through work with objects and fingers, which provide students with a consistent set of five leading to 10. Students learn to subitize small groups in larger groups with a tool they literally carry with them. Connections to written representations such as a number bond or five frame allow students to begin to organize their discoveries.

This work helps students deepen their understanding of number because a set can be taken apart into more than one group or separated individually. The total in a set is the same regardless of how it is arranged or taken apart.

Students engage in Mathematical Practice 4 (Model with mathematics) as they use their tools to solve a real-life problem and record their thinking using numbers and drawings.

Key vocabulary:

• count
• five frame
• number bond
• subtraction
• take apart
• total

Special materials needed:

• counters in two colors
• five frame
• number bond
• record sheet (or other tool to record thinking)
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• 1. Understand taking apart within 5 (C)