Lesson plan

Create equal shares by partitioning circles into halves, thirds, and fourths

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
teaches Common Core State Standards CCSS.Math.Practice.MP3 http://corestandards.org/Math/Practice/MP3

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Big Ideas: Geometric shapes can be partitioned into equal shares of halves, thirds, and fourths. In this lesson, students will identify and partition equal shares of a circle. Students will partition circles into halves, thirds, and fourths and recognize that as they partition the circles into more pieces, the pieces get smaller. This lesson builds on a student's prior knowledge of equal and unequal shares of geometric shapes. In this task, students are asked to identify and partition cookies (circles) into equal shares, namely halves, thirds, and fourths in order to share with friends. Students also understand that the number of partitioned parts, composed together, makes a whole. This lesson sets the foundation for partitioning rectangles into halves, thirds, and fourths. Vocabulary: partition, equal, equal shares, half, halves, third, fourth, quarter, whole, fraction Special Materials: copy of cookie document (see below)