Lesson plan

Use addition or subtraction to find the difference

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.7 http://corestandards.org/Math/Content/2/NBT/B/7
teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.9 http://corestandards.org/Math/Content/2/NBT/B/9

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Big Ideas: Addition and subtraction are related operations. Addition or subtraction can be used to determine the difference between two numbers. In this lesson, students play a game with the goal of raising $1000 to build a new playground at their school. For each turn, students calculate the total playground fund so far and figure out the amount they still need to reach their $1000 goal. The thought process of calculating up to a goal number moves students towards finding the difference by counting up. This task strengthens their understanding of the relationship between addition and subtraction. The ability to think flexibly about operations will assist students in solving word problems with subtraction or missing addends. Vocabulary: difference, one thousand, meters, dollars Special Materials: Set of Playground Builders Game Cards per pair or group Game Record Sheet per pair or group paper or individual whiteboards markers or crayons