Lesson plan

Create equal shares by partitioning rectangles 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 attributes (such as sides and angles) give descriptive information about a shape’s properties and orientation, which supports visualization and problem solving when partitioning shapes into smaller, equal shares. In this lesson students will identify and partition equal shares of a rectangle. Students will partition rectangles into halves, thirds, and fourths and recognize that as they partition the rectangles 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 brownies (rectangles) 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 other geometric shapes into halves, thirds, and fourths. Vocabulary: partition, equal, equal shares, half, halves, third, fourth, quarter, whole Special Materials: copy of brownie document Grid paper (optional) Dot paper (optional)