Lesson plan

Add up to four two-digit numbers by changing the order of the addends

teaches Common Core State Standards CCSS.Math.Content.2.NBT.B.6 http://corestandards.org/Math/Content/2/NBT/B/6
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.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: We can add numbers in any order to get a sum. Numbers can be decomposed into smaller parts. The parts can be added in any order yet still be equivalent. In this lesson, students choose four games to play at a carnival to earn themselves tickets. Students then shop at the prize booth to spend their tickets on prizes of various ticket values. Students are given many opportunities in this task to add two (and sometimes) three-digit numbers. Students will use the structure of the numbers (place value and properties of operations) to choose the order of their addends in an effort to make addition easier. Students will also subtract to find out how many tickets they have remaining. Perseverance is a major theme of this lesson as students may have to add multiple combinations to find out which prizes they can "afford". Vocabulary: add, sum, addends, subtract Special Materials: Print and copy the Task Handout and the Formative Assessment Handout if desired.