# 10. Design a flag (A)

teaches Common Core State Standards CCSS.Math.Content.2.G.A.3 http://corestandards.org/Math/Content/2/G/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2

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Lesson objective: Solve problems involving partitioning shapes.

This lesson provides an opportunity for students to apply their knowledge and understanding of partitioning shapes to a real-life situation. Students are asked to create a flag out of a shape that has been partitioned into halves, thirds, or fourths.

Key Concept students will use:

• Shapes can be partitioned into equal parts; a whole can be divided into two halves, three thirds, or four quarters/fourths.

Skills students will use:

• partitioning shapes into equal parts (Grade 1, Unit 17)
• partitioning shapes into equal parts with different shapes

Students engage in Mathematical Practice 2 (Reason abstractly and quantitatively) as they use their knowledge of equal parts to partition shapes in ways that result in equal shares having different shapes. Students also engage in Mathematical Practice 3 (Construct viable arguments) as they articulate their thinking of why parts are equal or unequal, as well as understand and critique the explanations of others.

Key vocabulary:

• equal
• fourth
• half
• partition
• unequal

Special materials needed:

• sticks for flag poles (optional)
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