Lesson plan

Candy for a Friend: Trajectory of Understanding

teaches Common Core State Standards CCSS.Math.Content.K.NBT.A.1 http://corestandards.org/Math/Content/K/NBT/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4
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Students will understand how to decompose a teen number into ten and some ones. The structure of the task requires students to listen to a story problem and represent their understanding of how to decompose a teen number by using objects or drawings. The suggested public discussion of student work shows a trajectory of understanding from a basic interpretation of a teen number to a more sophisticated understanding of how to decompose a teen number. All student work shown is a representation through drawing and numbers and some students used manipulatives. The trajectory of understanding is seen within the level of abstraction and thought processes of the students to arrive at the same answer but not necessarily with the same understanding of how to compose and decompose teen numbers. It is helpful to discuss this trajectory publicly with students to provide a platform to discuss the importance of decomposing a teen number in relation to the place value of the numerals in a teen number. Three pieces of work are shown. The first shows a basic understanding of picking 16 single pieces of candy. The next response shows a student showing 16 pieces of candy (4 pieces in 4 different boxes), which shows an understanding of decomposing a number. The final sample shows a solid understanding of the decomposition process of a teen number into a ten and some more and includes an equation to represent the total. This Student Work Discussion Plan was created by a member of the 2015 Delaware Dream Team. Special Materials: Any manipulatives or tools to aid in solving the problem: blocks, counters, ten frames.