Lesson plan

Solve addition and subtraction problems within 100 by using a variety of strategies

teaches Common Core State Standards CCSS.Math.Content.2.MD.B.5 http://corestandards.org/Math/Content/2/MD/B/5
teaches Common Core State Standards CCSS.Math.Practice.MP4 http://corestandards.org/Math/Practice/MP4

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Big Ideas: When we are solving addition and subtraction problems we need to think about what we know and what we need to find out or what part is missing. When we compare two numbers we are thinking about the difference between those numbers or the distance between those two numbers. This lesson builds on students' work with solving compare problems. Students are presented with a set of heights for the Anderson family. Some of the measurements are missing. When students are finding the heights of Blake and Brylee and figuring out how much Blake needs to grow they are working on the "Big Idea" of finding the difference or distance between numbers. The number line model helps students visualize the distance between the numbers. As students solve problems they are thinking about what they know in the problem and what they need to find out. Compare problems have no implied action in them so students may use both addition and subtraction to solve and think about the problems. Vocabulary: compare, difference, more than, shorter than, number line Special Materials: 100 chart classroom number line 0-100 individual number lines math tools (cubes, counters)