Lesson plan

Subtract within 1000 using expanded form

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.MP3 http://corestandards.org/Math/Practice/MP3
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: Numbers can be decomposed and written in expanded form. The values can be reorganized to subtract. In this lesson students apply the expanded form (break-apart) strategy to subtraction. Students work to discover if this strategy works for subtraction as well as for addition. The focus is on the value of each place value and how you can reorganize the number while keeping the total value the same. Special Materials: Make base ten blocks available for students