Lesson plan

# 5. Partition shapes into halves and quarters (A)

teaches Common Core State Standards CCSS.Math.Content.1.G.A.3 http://corestandards.org/Math/Content/1/G/A/3
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Lesson objective: Apply knowledge of partitioning shapes into halves and fourths to solve a real-world problem.

This lesson provides an opportunity for students to apply their knowledge and understanding of partitioning shapes into halves and fourths to a real-life situation. Students are asked to help a student partition her garden in an attempt to plant four different vegetables equally.

Key Concept students will use:

• Shapes, like rectangles, can be partitioned into four smaller equal shares, and the whole is described as four of the smaller equal shares.

Skills students will use:

• Model and compose shapes (Grade K, Unit 15)
• Partition shapes into four equal parts, called fourths
• Partition shapes into two equal parts, called halves

Students engage in Mathematical Practice 3 (construct viable arguments) as they construct arguments about their own partitioning, but also distinguish correct reasoning from that which is flawed.

Key vocabulary:

• equal shares
• fourths
• partition

Special materials needed:

• pattern blocks
• shape cut-outs
• tangrams