Lesson plan

Add or subtract a number within 1000 in parts

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
teaches Common Core State Standards CCSS.Math.Practice.MP1 http://corestandards.org/Math/Practice/MP1
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: Numbers can be decomposed into parts of different sizes to solve addition or subtraction problems. Counting to whole hundreds or tens makes adding and subtracting easier. In this lesson, students compare numbers by using a number line. The number line tool helps students think flexibly about larger numbers by breaking them into parts of different sizes that make sense in the context of the problem. Students will use what they know about basic facts and anchors to tens and hundreds to choose the size of the parts. Comparison questions can be solved by going up or down the number line (adding or subtracting). Vocabulary: number line, decompose, tens, hundreds, compare, meters, kilometers Special Materials: Students will need paper or individual whiteboards to draw number lines on.