# 10. Arranging a collection (A)

teaches Common Core State Standards CCSS.Math.Content.K.CC.B.5 http://corestandards.org/Math/Content/K/CC/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Lesson objective: Solve problems by creating and counting various arrangements of the same number.

This lesson provides an opportunity for students to apply their knowledge and understanding of counting to a real-life situation. Students are asked to create different arrangements of tickets that meet certain criteria but always have the same number of tickets.

Key Concept students will use:

• Arranging a set of objects in different ways does not change the number of objects counted.

Skills students will use:

• rote counting to 10 (Grade K, Unit 1)
• one-to-one correspondance (Grade K, Unit 1)
• counting sets of objects to answer the question "How many?"

Students engage in Mathematical Practice 6 (Attend to precision) as they consider and carefully create and count multiple arrangements of the 10 tickets.

Key vocabulary:

• arrangement
• fair (as in a State Fair)
• tickets

Special materials needed:

• cubes (for modeling and counting)
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