Lesson plan

Solve addition and subtraction word problems by using multiple strategies and rounding to check for reasonableness

teaches Common Core State Standards CCSS.Math.Content.3.NBT.A.1 http://corestandards.org/Math/Content/3/NBT/A/1
teaches Common Core State Standards CCSS.Math.Content.3.NBT.A.2 http://corestandards.org/Math/Content/3/NBT/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: Addition and subtraction are related in a part to whole relationship. Addition is the inverse of subtraction. Therefore, we can use addition to solve subtraction problems. This lesson builds on solving addition and subtraction problems within 1000. This task presents students with a coin bank to compare values of coins (quarters, nickels, dimes, pennies) and find possible values by adding and subtracting. Students will figure out possible totals and combinations using criteria outlined in the task. Students can apply rounding to problem solve or determine reasonableness of solutions while using addition/subtraction strategies. The mathematical concepts in this lesson build on students’ future work with problem solving and developing an understanding of the relationship between multiplication and division. Vocabulary: addition, subtraction, place value, inverse operation, decompose, rounding