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Lesson Plan

Identify line-symmetric figures by folding into matching parts

teaches Common Core State Standards CCSS.Math.Content.4.G.A.3
teaches Common Core State Standards CCSS.Math.Practice.MP4
teaches Common Core State Standards CCSS.Math.Practice.MP7
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Big Ideas: A two-dimensional shape has a line of symmetry if it can be folded along a line into matching parts. This lesson builds on students' knowledge of two-dimensional figures and geometric attributes. The task asks students to decide which of twelve given shapes can be folded in half to make matching parts. Through exploration of each shape, students will see that some shapes cannot be folded into matching parts while other shapes can be folded one or more times, leading students to an understanding of a line of symmetry. Their work in identifying lines of symmetry builds towards students' future work in drawing symmetric figures. Vocabulary: line of symmetry, symmetric figure, symmetry Special Materials: shapes from task cards for students to fold (optional)
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