Lesson plan

Solve addition problems as lengths of distance by using a number line model

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: Distance can be composed of a collection of units, side by side. Numbers can be added in any order and the sum will still be the same. This lesson builds on students' work with distance as a quantity on a line. Students add quantities of length to find a new length and consider the magnitude of that length on a number line. Students are asked to solve several tasks involving length: Given an amount is there enough? What to do with the leftovers? Given lengths can a new length be made? Students work on two big ideas. Quantities of length put together side by side can show the distance or quantity of a new total length. Students work on the big idea of composing and decomposing as they put numbers together and take numbers apart. Vocabulary: addition, leftover, difference, number line, doubles Special Materials: number lines 0-40